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• Filtering serial port io

  - by mr odus

  I am currently working on a project where I communicate with hardware via a com port on its respective pc(win xp or 7) It is a fairly large project and sifting through the log file can be a bit of pain. This is my current setup. I use putty to do the actual serial communication, and write it to a log file. Then using MinGW Msys I filter it using tail -f "puttyLog" | grep -i "search term" Is there a better way to do this? I mean specifically filtering the input in realtime. Not that mine is terrible, but it still involves having to read from a log and sometimes there have been hangups where it will be delayed for a minute or 2. I have used software in the past with a main io window and then internal filter panels, but can no longer remember or find it.

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• Possible disk IO issue

  - by Tim Meers

  I've been trying to really figure out what my IOPS are on my DB server array and see if it's just too much. The array is four 72.6gb 15k rpm drives in RAID 5. To calculate IOPS for RAID 5 the following formula is used: (reads + (4 * Writes)) / Number of disks = total IOPS. The formula is from MSDN. I also want to calculate the Avg Queue Length but I'm not sure where they are getting the formula from, but i think it reads on that page as avg que length/number of disks = actual queue. To populate that formula I used the perfmon to gather the needed information. I came up with this, under normal production load: (873.982 + (4 * 28.999)) / 4 = 247.495. Also the disk queue lengh of 14.454/4 = 3.614. So to the question, am I wrong in thinking this array has a very high disk IO? Edit I got the chance to review it again this morning under normal/high load. This time with even bigger numbers and IOPS in excess of 600 for about 5 minutes then it died down again. But I also took a look at the Avg sec/Transfer, %Disk Time, and %Idle Time. These number were taken when the reads/writes per sec were only 332.997/17.999 respectively. %Disk Time: 219.436 %Idle Time: 0.300 Avg Disk Queue Length: 2.194 Avg Disk sec/Transfer: 0.006 Pages/sec: 2927.802 % Processor Time: 21.877 Edit (again) Looks like I have that issue solved. Thanks for the help. Also for a pretty slick parser I found this: http://pal.codeplex.com/ It works pretty well for breaking down the data into something usable.

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• io operations in compilers

  - by Aastha

  How are constructs of io operations handled by a compiler? Like the RTL mapping for memory related operations which is done in a compiler at the time of target code generation, where and how exactly is the same done for io operations? How are the appeoaches different for processors supporting MMIO and I/O mapped I/O? Are there any optimizations done for the io operations in compilers?

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• Multi Player game using Nodejs and Socket IO

  - by Kishorevarma

  I am trying out multi player racing game using Node and Socket IO ,express . So I have tried simple example to see the latency between node server and the clients. I have a draggable image in client . when I move the image ienter code heren one client ,it has to move in all clients. so basically when I am moving the image I am sending the image position to the node server in a json format , then from there I am broadcasting to all clients. there is a ~approx 300ms latency from the time. following are the results. Client 1 sending data to server at : 286136 (timestamp) Server received at : 286271 Client2 received data at : 286470 Client3 received data at : 286479 Client4 received data at : 286487 Client5 received data at : 286520 the latency between move from client1 to client5 is 384ms. its too hight for a racing game .. here is my server code. var app = require('express').createServer(); var io = require('socket.io'); var http = require('http'); var http_server = http.createServer(); var server = http.createServer(app); server.listen(3000); var socket = io.listen(server,{ log: false }); socket.sockets.on('connection', function (client) { client.on('message', function (data){ console.log("data arrived to server",new Date().getTime()); // Below both statements are giving same latency between the client 1 and client 5 client.broadcast.emit('message',data); //socket.sockets.emit('message',data); }); }); 1) Is there any way to optimize the server code to reduce the latency? 2) is this expected latency using node and websockets ? 3) is socket io can't broadcast the data asynchronously (I mean at a same time) ? Thanks Kishorevarma

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• How to remove duplicate line in a file

  - by Abs

  Hi I'm using the below method to write to a file from the Jtextarea and I call this method every 30 second within a Timer but instead to add only new line in file it rewrite the entire lines contained in Jtextarea so then I have duplicate lines. I want to avoid this and update the file just with new lines. Could you help me please. public void loger() { FileWriter writer = null; try { writer = new FileWriter("MBM_Log_"+date()+".txt" , true); textArea.write(writer); } catch (IOException exception) { System.err.println("log error"); exception.printStackTrace(); } finally { if (writer != null) { try { writer.close(); } catch (IOException exception) { System.err.println("Error closing writer"); exception.printStackTrace(); } } } }

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• PHP File Upload second file does not upload, first file does without error

  - by Curtis

  So I have a script I have been using and it generally works well with multiple files... When I upload a very large file in a multiple file upload, only the first file is uploaded. I am not seeing an errors as to why. I figure this is related to a timeout setting but can not figure it out - Any ideas? I have foloowing set in my htaccess file php_value post_max_size 1024M php_value upload_max_filesize 1024M php_value memory_limit 600M php_value output_buffering on php_value max_execution_time 259200 php_value max_input_time 259200 php_value session.cookie_lifetime 0 php_value session.gc_maxlifetime 259200 php_value default_socket_timeout 259200

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• scp No such file or directory

  - by Joe

  I've a confusing question for which superuser doesn't seem to have a good answer, and neither google. I'm trying to scp a file from a remote server to my local machine. The command is this scp user@server:/path/to/source/file.gz /path/to/destination The error I get is: scp: /path/to/source/file.gz: No such file or directory user is my username on the server. The command syntax appears fine to me. ssh works fine and I can cd to the file and it doesn't seem to be an access control issue? Thanks; Edit: Thank you John. I spotted the issue. ls returned this: -r--r--r-- 1 nobody users 168967171 Mar 10 2009 /path/to/source/file.gz So, the file was on a read-only file system and user is able to read it but not scp. I just copied the file to a different directory and chown it and worked fine. It would be good if someone can explain why this is the case though.

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• close file with fclose() but file still in use

  - by Marco

  Hi all, I've got a problem with deleting/overwriting a file using my program which is also being used(read) by my program. The problem seems to be that because of the fact my program is reading data from the file (output.txt) it puts the file in a 'in use' state which makes it impossible to delete or overwrite the file. I don't understand why the file stays 'in use' because I close the file after use with fclose(); this is my code: bool bBool = true while(bBool){ //Run myprogram.exe tot generate (a new) output.txt //Create file pointer and open file FILE* pInputFile = NULL; pInputFile = fopen("output.txt", "r"); // //then I do some reading using fscanf() // //And when I'm done reading I close the file using fclose() fclose(pInputFile); //The next step is deleting the output.txt if( remove( "output.txt" ) == -1 ){ //ERROR }else{ //Succesfull } } I use fclose() to close the file but the file remains in use by my program until my program is totally shut down. What is the solution to free the file so it can be deleted/overwrited? In reality my code isn't a loop without an end ; ) Thanks in advance! Marco Update Like ask a part of my code which also generates the file 'in use'. This is not a loop and this function is being called from the main(); Here is a piece of code: int iShapeNr = 0; void firstRun() { //Run program that generates output.txt runProgram(); //Open Shape data file FILE* pInputFile = NULL; int iNumber = 0; pInputFile = fopen("output.txt", "r"); //Put all orientations of al detected shapes in an array int iShapeNr = 0; int iRotationBuffer[1024];//1024 is maximum detectable shapes, can be changed in RoboRealm int iXMinBuffer[1024]; int iXMaxBuffer[1024]; int iYMinBuffer[1024]; int iYMaxBuffer[1024]; while(feof(pInputFile) == 0){ for(int i=0;i<9;i++){ fscanf(pInputFile, "%d", &iNumber); fscanf(pInputFile, ","); if(i == 1) { iRotationBuffer[iShapeNr] = iNumber; } if(i == 3){//xmin iXMinBuffer[iShapeNr] = iNumber; } if(i == 4){//xmax iXMaxBuffer[iShapeNr] = iNumber; } if(i == 5){//ymin iYMinBuffer[iShapeNr] = iNumber; } if(i == 6){//ymax iYMaxBuffer[iShapeNr] = iNumber; } } iShapeNr++; } fflush(pInputFile); fclose(pInputFile); } The while loop parses the file. The output.txt contains sets of 9 variables, the number of sets is unknown but always in sets of 9. output.txt could contain for example: 0,1,2,3,4,5,6,7,8,8,7,6,5,4,1,2,3,0

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• File.Exists() returns false, but not in debug

  - by Tor Haugen

  I'm being completely confused here folks, My code throws an exception because File.Exists() returns false public override sealed TCargo ReadFile(string fileName) { if (!File.Exists(fileName)) { throw new ArgumentException("Provided file name does not exist", "fileName"); } Visual studio breaks at the throw statement, and I immediately check the value of File.Exists(fileName) in the immediate window. It returns true. When I drag the breakpoint back up to the if statement and execute it again, it throws again. fileName is an absolute path to a file. I'm not creating the file, nor writing to it (it's there all along). If I paste the path into the open dialog in Notepad, it reads the file without problems. The code is executing in a background worker. It's the only complicating factor I can think of. I am positive the file has not been opened already, either in the worker thread or elsewhere. What's going on here?

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• Determining cause of high NFS/IO utilization without iotop

  - by Matt

  I have a server that is doing an NFSv4 export for user's home directories. There are roughly 25 users (mostly developers/analysts) and about 40 servers mounting the home directory export. Performance is miserable, with users often seeing multi-second lags for simple commands (like ls, or writing a small text file). Sometimes the home directory mount completely hangs for minutes, with users getting "permission denied" errors. The hardware is a Dell R510 with dual E5620 CPUs and 8 GB RAM. There are eight 15k 2.5” 600 GB drives (Seagate ST3600057SS) configured in hardware RAID-6 with a single hot spare. RAID controller is a Dell PERC H700 w/512MB cache (Linux sees this as a LSI MegaSAS 9260). OS is CentOS 5.6, home directory partition is ext3, with options “rw,data=journal,usrquota”. I have the HW RAID configured to present two virtual disks to the OS: /dev/sda for the OS (boot, root and swap partitions), and /dev/sdb for the home directories. What I find curious, and suspicious, is that the sda device often has very high utilization, even though it only contains the OS. I would expect this virtual drive to be idle almost all the time. The system is not swapping, according to "free" and "vmstat". Why would there be major load on this device? Here is a 30-second snapshot from iostat: Time: 09:37:28 AM Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 44.09 0.03 107.76 0.13 607.40 11.27 0.89 8.27 7.27 78.35 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 0.00 44.09 0.03 107.76 0.13 607.40 11.27 0.89 8.27 7.27 78.35 sdb 0.00 2616.53 0.67 157.88 2.80 11098.83 140.04 8.57 54.08 4.21 66.68 sdb1 0.00 2616.53 0.67 157.88 2.80 11098.83 140.04 8.57 54.08 4.21 66.68 dm-0 0.00 0.00 0.03 151.82 0.13 607.26 8.00 1.25 8.23 5.16 78.35 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-2 0.00 0.00 0.67 2774.84 2.80 11099.37 8.00 474.30 170.89 0.24 66.84 dm-3 0.00 0.00 0.67 2774.84 2.80 11099.37 8.00 474.30 170.89 0.24 66.84 Looks like iotop is the ideal tool to use to sniff out these kinds of issues. But I'm on CentOS 5.6, which doesn't have a new enough kernel to support that program. I looked at Determining which process is causing heavy disk I/O?, and besides iotop, one of the suggestions said to do a "echo 1 /proc/sys/vm/block_dump". I did that (after directing kernel messages to tempfs). In about 13 minutes I had about 700k reads or writes, roughly half from kjournald and the other half from nfsd: # egrep " kernel: .*(READ|WRITE)" messages | wc -l 768439 # egrep " kernel: kjournald.*(READ|WRITE)" messages | wc -l 403615 # egrep " kernel: nfsd.*(READ|WRITE)" messages | wc -l 314028 For what it's worth, for the last hour, utilization has constantly been over 90% for the home directory drive. My 30-second iostat keeps showing output like this: Time: 09:36:30 PM Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 6.46 0.20 11.33 0.80 71.71 12.58 0.24 20.53 14.37 16.56 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 0.00 6.46 0.20 11.33 0.80 71.71 12.58 0.24 20.53 14.37 16.56 sdb 137.29 7.00 549.92 3.80 22817.19 43.19 82.57 3.02 5.45 1.74 96.32 sdb1 137.29 7.00 549.92 3.80 22817.19 43.19 82.57 3.02 5.45 1.74 96.32 dm-0 0.00 0.00 0.20 17.76 0.80 71.04 8.00 0.38 21.21 9.22 16.57 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-2 0.00 0.00 687.47 10.80 22817.19 43.19 65.48 4.62 6.61 1.43 99.81 dm-3 0.00 0.00 687.47 10.80 22817.19 43.19 65.48 4.62 6.61 1.43 99.82

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• SQL Server IO handling mechanism can be severely affected by high CPU usage

  - by sqlworkshops

  Are you using SSD or SAN / NAS based storage solution and sporadically observe SQL Server experiencing high IO wait times or from time to time your DAS / HDD becomes very slow according to SQL Server statistics? Read on… I need your help to up vote my connect item – https://connect.microsoft.com/SQLServer/feedback/details/744650/sql-server-io-handling-mechanism-can-be-severely-affected-by-high-cpu-usage. Instead of taking few seconds, queries could take minutes/hours to complete when CPU is busy.In SQL Server when a query / request needs to read data that is not in data cache or when the request has to write to disk, like transaction log records, the request / task will queue up the IO operation and wait for it to complete (task in suspended state, this wait time is the resource wait time). When the IO operation is complete, the task will be queued to run on the CPU. If the CPU is busy executing other tasks, this task will wait (task in runnable state) until other tasks in the queue either complete or get suspended due to waits or exhaust their quantum of 4ms (this is the signal wait time, which along with resource wait time will increase the overall wait time). When the CPU becomes free, the task will finally be run on the CPU (task in running state).The signal wait time can be up to 4ms per runnable task, this is by design. So if a CPU has 5 runnable tasks in the queue, then this query after the resource becomes available might wait up to a maximum of 5 X 4ms = 20ms in the runnable state (normally less as other tasks might not use the full quantum).In case the CPU usage is high, let’s say many CPU intensive queries are running on the instance, there is a possibility that the IO operations that are completed at the Hardware and Operating System level are not yet processed by SQL Server, keeping the task in the resource wait state for longer than necessary. In case of an SSD, the IO operation might even complete in less than a millisecond, but it might take SQL Server 100s of milliseconds, for instance, to process the completed IO operation. For example, let’s say you have a user inserting 500 rows in individual transactions. When the transaction log is on an SSD or battery backed up controller that has write cache enabled, all of these inserts will complete in 100 to 200ms. With a CPU intensive parallel query executing across all CPU cores, the same inserts might take minutes to complete. WRITELOG wait time will be very high in this case (both under sys.dm_io_virtual_file_stats and sys.dm_os_wait_stats). In addition you will notice a large number of WAITELOG waits since log records are written by LOG WRITER and hence very high signal_wait_time_ms leading to more query delays. However, Performance Monitor Counter, PhysicalDisk, Avg. Disk sec/Write will report very low latency times.Such delayed IO handling also occurs to read operations with artificially very high PAGEIOLATCH_SH wait time (with number of PAGEIOLATCH_SH waits remaining the same). This problem will manifest more and more as customers start using SSD based storage for SQL Server, since they drive the CPU usage to the limits with faster IOs. We have a few workarounds for specific scenarios, but we think Microsoft should resolve this issue at the product level. We have a connect item open – https://connect.microsoft.com/SQLServer/feedback/details/744650/sql-server-io-handling-mechanism-can-be-severely-affected-by-high-cpu-usage - (with example scripts) to reproduce this behavior, please up vote the item so the issue will be addressed by the SQL Server product team soon.Thanks for your help and best regards,Ramesh MeyyappanHome: www.sqlworkshops.comLinkedIn: http://at.linkedin.com/in/rmeyyappan

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• Designing status management for a file processing module

  - by bot

  The background One of the functionality of a product that I am currently working on is to process a set of compressed files ( containing XML files ) that will be made available at a fixed location periodically (local or remote location - doesn't really matter for now) and dump the contents of each XML file in a database. I have taken care of the design for a generic parsing module that should be able to accommodate the parsing of any file type as I have explained in my question linked below. There is no need to take a look at the following link to answer my question but it would definitely provide a better context to the problem Generic file parser design in Java using the Strategy pattern The Goal I want to be able to keep a track of the status of each XML file and the status of each compressed file containing the XML files. I can probably have different statuses defined for the XML files such as NEW, PROCESSING, LOADING, COMPLETE or FAILED. I can derive the status of a compressed file based on the status of the XML files within the compressed file. e.g status of the compressed file is COMPLETE if no XML file inside the compressed file is in a FAILED state or status of the compressed file is FAILED if the status of at-least one XML file inside the compressed file is FAILED. A possible solution The Model I need to maintain the status of each XML file and the compressed file. I will have to define some POJOs for holding the information about an XML file as shown below. Note that there is no need to store the status of a compressed file as the status of a compressed file can be derived from the status of its XML files. public class FileInformation { private String compressedFileName; private String xmlFileName; private long lastModifiedDate; private int status; public FileInformation(final String compressedFileName, final String xmlFileName, final long lastModified, final int status) { this.compressedFileName = compressedFileName; this.xmlFileName = xmlFileName; this.lastModifiedDate = lastModified; this.status = status; } } I can then have a class called StatusManager that aggregates a Map of FileInformation instances and provides me the status of a given file at any given time in the lifetime of the appliciation as shown below : public class StatusManager { private Map<String,FileInformation> processingMap = new HashMap<String,FileInformation>(); public void add(FileInformation fileInformation) { fileInformation.setStatus(0); // 0 will indicates that the file is in NEW state. 1 will indicate that the file is in process and so on.. processingMap.put(fileInformation.getXmlFileName(),fileInformation); } public void update(String filename,int status) { FileInformation fileInformation = processingMap.get(filename); fileInformation.setStatus(status); } } That takes care of the model for the sake of explanation. So whats my question? Edited after comments from Loki and answer from Eric : - I would like to know if there are any existing design patterns that I can refer to while coming up with a design. I would also like to know how I should go about designing the status management classes. I am more interested in understanding how I can model the status management classes. I am not interested in how other components are going to be updated about a change in status at the moment as suggested by Eric.

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• High Load - Low IO - Low CPU usage

  - by devup

  I have a system whose load is rather high. As you can see from the top output below, CPU usage and I/O is negligible: top - 17:31:59 up 4 days, 2:34, 2 users, load average: 1.00, 0.99, 1.00 Tasks: 71 total, 1 running, 70 sleeping, 0 stopped, 0 zombie Cpu(s): 2.0%us, 2.0%sy, 0.0%ni, 95.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 960720k total, 707288k used, 253432k free, 67328k buffers Swap: 2811896k total, 2644k used, 2809252k free, 528928k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 15310 root 20 0 2512 1128 888 R 2.1 0.1 0:00.05 top I would appreciate any assistance with isolating the cause(s) of high load for when I/O and CPU are not factors.

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• batch file infinite loop when parsing file

  - by Bart

  Okay, this should be a really simple task but its proving to be more complicated than I think it should be. I'm clearly doing something wrong, and would like someone else's input. What I would like to do is parse through a file containing paths to directories and set permissions on those directories. An example line of the input file. There are several lines, all formatted the same way, with a different path to a directory. E:\stuff\Things\something else (X)\ (The file in question is generated under Cygwin using find to list all directories with "(X)" in the name. The file is then passed through unix2win to make it windows compatible. I've also tried manually creating the input file from within windows to rule out the file's creation method as the problem.) Here's where I'm stuck... I wrote the following quick and dirty batch file in Windows XP and it worked without any issues at all, but it will not work in server 2k8. Batch file code to run through the file and set permissions: FOR /F "tokens=*" %%A IN (dirlist.txt) DO echo y| cacls "%%A" /T /C /G "Domain Admins":f "Some Group":f "some-security-group":f What this is SUPPOSED to do (and does in XP) is loop through the specified file (dirlist.txt) and run cacls.exe on each directory it pulls from the file. The "echo y|" is in there to automagically confirm when cacls helpfully asks "are you sure?" for every directory in the list. Unfortunately, however, what it DOES is fall into an infinite loop. I've tried surrounding everything after "DO" with quotes, which prevents the endless loop but confuses cacls so it throws an error. Interestingly, I've tried running the code from after "DO" manually (obviously replacing the variable with the full path, copied straight from the file) at a command prompt and it runs as expected. I don't think it's the file or the loop, as adding quotes to the command to be executed prevents the loop from continuing past where it's supposed to... I really have no idea at this point. Any help would be appreciated. I have a feeling it's going to be something increadibly stupid... but I'm pulling my hair out so I thought I'd ask.

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• RAID 5 heavy IO hard freezes Ubuntu: Why?

  - by Luke has no name

  I have a software RAID 5 partition on LVM in Ubuntu (desktop, actually, but I'm using it as a server). I have been rsyncing a ton of data to it, and the computer was hard freezing, as in I needed to press "Reset". So I thought it was rsync. But I decided I'd try a dd if=/dev/zero of=/path/to/raid5 and sure enough, the computer locked up. Did an identical dd to a JBOD partition on the same machine, and it didn't crash. Assuming a clean RAID5 partition, tri-core processor 2GB of ram, 6GB swap, what could be causing this?

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• Utility to record IO statistics (random/sequential, block sizes, read/write ratio) in Unix

  - by Michael Pearson

  As part of provisioning our new server (see other SF) I'd like to find out the following: ratio of random to sequential reads & writes amount of data read & written at a time (pref in histogram form) I can already figure out our reads/writes on a per-operation and overall data level using iostat & dstat, but I'd like to know more. For example, I'd like to know that we're mostly random 16kb reads, or a lot of sequential 64kb reads with random writes. We're (currently) on an Ubuntu 10.04 VM. Is there a utility that I can run that will record and present this information for me?

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• Android: writing a file to sdcard

  - by Sumit M Asok

  I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved. I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest and tried many different combinations of tutorials I found on the net. All I could find was using the openFileOutput("",MODE_WORLD_READABLE) method, of the activity but how my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written, so giving an activity object didn't work even though I tried it. The app has come a long way and I cannot change how the app is currently written. Please, someone help me? CODE: File file = new File(bgdmanip.savLocation); FileOutputStream filecon = null; filecon = new FileOutputStream(file); // bgdmanip.savLocation holds the whole files path byte[] myByte; myByte = Base64Coder.decode(seReply); Log.d("myBytes", String.valueOf(myByte)); bos.write(myByte); filecon.write(myByte); myvals = x * 11024; seReply is a string reply from HttpPost response. the second set of code is looped with reference to x. the file is created but remains 0 bytes

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• Ruby : UTF-8 IO

  - by subtenante

  I use ruby 1.8.7. I try to parse some text files containing greek sentences, encoded in UTF-8. (I can't much paste here sample files, because they are subject to copyright. Really just some greek text encoded in UTF-8.) I want, for each file, to parse the file, extract all the words, and make a list of each new word found in this file. All that saved to one big index file. Here is my code : #!/usr/bin/ruby -KU def prepare_line(l) l.gsub(/^\s*[ST]\d+\s*:\s*|\s+$|\(\d+\)\s*/u, "") end def tokenize(l) l.split /['·.;!:\s]+/u end $dict = {} $cpt = 0 $out = File.new 'out.txt', 'w' def lesson(file) $cpt = $cpt + 1 file.readlines.each do |l| $out.puts l l = prepare_line l tokenize(l).each do |t| unless $dict[t] $dict[t] = $cpt $out.puts " #{t}\n" end end end end Dir.new('etc/').each do |filename| f = File.new("etc/#{filename}") unless File.directory? f lesson f end end Here is part of my output : ?@???†?†?????????? ?...[snip very long hangul/hanzi mishmash]... ????????†? ???N2 : ?e?te?? (2) µ???µa (Note that the puts l part seems to work fine, at the end of the given output line.) Any idea what is wrong with my code ? (General comments about ruby idioms I could use are very welcome, I'm really a beginner.)

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• Microsoft Management Console stops working when I add snap-in to it

  - by JayaprakashReddy

  I have Windows 7 Ultimate OS. I'm opening mmc.exe as administrator and trying add Certificates or any other snap-in, then while loading that snap-in MMC breaks and displays following message and after that it closes automatically once I click on close button on that message. What could be the problem? I did following to fix the problem but couldn't succeed any of these: I tried to repair the OS I repaired files using this method Even repaired the installation using this link Update: *@oldskool: Here is the debug process output:* Sorry its a long output text. 'mmc.exe': Loaded 'C:\Windows\System32\mmc.exe', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ntdll.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\kernel32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\KernelBase.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\gdi32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\user32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\lpk.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\usp10.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\msvcrt.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mfc42u.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ole32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\rpcrt4.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\oleaut32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\odbc32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\advapi32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\sechost.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mmcbase.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\shlwapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\uxtheme.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\duser.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\imm32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\msctf.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\odbcint.dll', Binary was not built with debug information. 'mmc.exe': Loaded 'C:\Windows\System32\dui70.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.16661_none_420fe3fa2b8113bd\comctl32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\shell32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\cryptbase.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\urlmon.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wininet.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\iertutil.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\crypt32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\msasn1.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\clbcatq.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mmcndmgr.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dwmapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\oleacc.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\cryptsp.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\rsaenh.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\RpcRtRemote.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mlang.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\xmllite.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\version.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\apphelp.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\msi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin\mscormmc.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mscoree.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.4927_none_d08a205e442db5b5\msvcr80.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\azroleui.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\atl.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\secur32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\netutils.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dsrole.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\logoncli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dsuiext.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ntdsapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ws2_32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\nsi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\activeds.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\adsldpc.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\Wldap32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mpr.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\netapi32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\srvcli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wkscli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\certmgr.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\certcli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\CertEnroll.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\cryptui.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ncrypt.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\bcrypt.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wintrust.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\imagehlp.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\sspicli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\aclui.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\IPHLPAPI.DLL', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\winnsi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\slc.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\comsnap.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mfc42.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\mycomput.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\devmgr.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\setupapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\cfgmgr32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\devobj.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\devrtl.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\newdev.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dmdskmgr.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dmutil.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dmdskres.dll', Binary was not built with debug information. 'mmc.exe': Loaded 'C:\Windows\System32\dmdskres2.dll', Binary was not built with debug information. 'mmc.exe': Loaded 'C:\Windows\System32\gpedit.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dssec.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\authz.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\dfscli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\samcli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\gpapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\framedynos.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wtsapi32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ipsmsnap.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\winipsec.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\userenv.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\profapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\ipsecsnp.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\polstore.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\localsec.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wdc.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\pdh.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\pdhui.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\comdlg32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\credui.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wevtapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\pla.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\tdh.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\winsta.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\utildll.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\browcli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\vdmdbg.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\pmcsnap.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\winspool.drv', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\puiapi.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wsecedit.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\scecli.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\filemgmt.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Program Files\Microsoft SQL Server\100\Tools\Binn\SqlManager.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.vc80.mfc_1fc8b3b9a1e18e3b_8.0.50727.4053_none_cbf21254470d8752\mfc80u.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.4927_none_d08a205e442db5b5\msvcp80.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.vc80.atl_1fc8b3b9a1e18e3b_8.0.50727.4053_none_d1c738ec43578ea1\ATL80.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.windows.common-controls_6595b64144ccf1df_5.82.7600.16661_none_ebfb56996c72aefc\comctl32.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.vc80.mfcloc_1fc8b3b9a1e18e3b_8.0.50727.4053_none_03ca5532205cb096\mfc80ENU.dll', Binary was not built with debug information. 'mmc.exe': Loaded 'C:\Program Files\Microsoft SQL Server\100\Tools\Binn\Resources\1033\SqlManager.rll', Binary was not built with debug information. 'mmc.exe': Loaded 'C:\Windows\System32\msxml6.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Program Files\Microsoft SQL Server\90\Tools\Binn\SqlManager.dll', Cannot find or open the PDB file 'mmc.exe': Loaded 'C:\Windows\System32\wbem\wbemcntl.dll', Cannot find or open the PDB file The thread 'Win32 Thread' (0xf74) has exited with code 0 (0x0). Unhandled exception at 0x774d35e3 in mmc.exe: 0xC0000374: A heap has been corrupted.

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• What are possible reasons for java.io.IOException: "The filename, directory name, or volume label sy

  - by Turismo

  I am trying to copy a file using the following code: File targetFile = new File(targetPath + File.separator + filename); ... targetFile.createNewFile(); fileInputStream = new FileInputStream(fileToCopy); fileOutputStream = new FileOutputStream(targetFile); byte[] buffer = new byte[64*1024]; int i = 0; while((i = fileInputStream.read(buffer)) != -1) { fileOutputStream.write(buffer, 0, i); } For some users the targetFile.createNewFile results in this exception: java.io.IOException: The filename, directory name, or volume label syntax is incorrect at java.io.WinNTFileSystem.createFileExclusively(Native Method) at java.io.File.createNewFile(File.java:850) Filename and directory name seem to be correct. The directory targetPath is even checked for existence before the copy code is executed and the filename looks like this: AB_timestamp.xml The user has write permissions to the targetPath and can copy the file without problems using the OS. As I don't have access to a machine this happens on yet and can't reproduce the problem on my own machine I turn to you for hints on the reason for this exception.

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• A non-blocking server with java.io

  - by Jon

  Everybody knows that java IO is blocking, and java NIO is non-blocking. In IO you will have to use the thread per client pattern, in NIO you can use one thread for all clients. Now my question follows: is it possible to make a non-blocking design using only the Java IO api. (not NIO) I was thinking about a pattern like this (obviously very simplified); List<Socket> li; for (Socket s : li) { InputStream in = s.getInputStream(); byte[] data = in.available(); in.read(data); // processData(data); (decoding packets, encoding outgoing packets } Also note that the client will always be ready for reading data. What are your opinions on this? Will this be suitable for a server that should at least hold a few hundred of clients without major performance issues?

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• File corruption after copying files in Windows 7 64 bit using two methods

  - by DustByte

  I have 5000 pictures and other files in a directory taking up 35 GB. I want to duplicate this directory. Method 1: I do a simple copy and paste of the directory in explorer. I have the habit of checking the checksums after copying important files. In this case I noticed that around 2000 files failed the MD5 test. At a closer inspection of a randomly chosen JPEG with different checksums it turns out that some XMP metadata had changed. In particular, the tag <MicrosoftPhoto:DateAcquired> had changed the date from 2009 to today (possibly around the time I was copying the files). I have no idea what triggered this XMP data to be changed and exactly when it was changed and why for these particular files, but at least it seems to explain the checksum discrepancy. Method 2: As I want the exact files to be duplicated, I tried the program FreeFileSync to mirror the directory, hoping no XMP metadata would mysteriously change. A checksum test in addition to a thorough file comparison test in FreeFileSync lead to two similar but yet different results: 31 files fail the checksum test, 23 files fail the file comparison test. The smaller set is not entirely contained in the bigger set, although many files occur in both. What is alarming here is that not only JPEGs are flagged as altered but also som AVIs, MPGs and a large 7-zip file. Closer inspection of a JPEG indicates that it is indeed corrupt: the bottom half of the picture is simply plain gray. Due to the size of the 7-zip file, I have not been able to pin down the discrepancy. Note, in both methods, every file has its correct file size after being copied. Question: Any thoughts on what is possibly going on here? I have never had this problem before, and I am now terrified that files get corrupted after simple actions like copy/paste and file sync. Even if I manage to successfully copy the files somehow, I would still like an explanation to this.

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• "io: postinst-must-call-ldconfig" when creating a package

  - by egarcia

  I'm trying to create an ubuntu .deb package for the (pretty awesome) Io Language. I am not the developer of that language, so I'm not familiar with its sourcecode yet. This is my first attempt at creating a .deb file. In order to create the .deb, I'm following these instructions: http://www.webupd8.org/2010/01/how-to-create-deb-package-ubuntu-debian.html So far I've been able to create a .deb file (io_2010.06.01-1_amd64.deb) and a changes file (io_201.06.01-1_amd64.changes). I'm using lintian to check the changes file, and it reports an issue I don't know how to resolve: $ lintian -Ivi io_2010.06.01-1_amd64.changes ... (lots of messages) I: io: no-symbols-control-file usr/lib/libiovmall.so I: io: no-symbols-control-file usr/lib/libgarbagecollector.so I: io: no-symbols-control-file usr/lib/libbasekit.so E: io: postinst-must-call-ldconfig usr/lib/libiovmall.so N: N: The package installs shared libraries in a directory controlled by the N: dynamic library loader. Therefore, the package must call "ldconfig" in N: its postinst script. N: N: Refer to Debian Policy Manual section 8.1.1 (ldconfig) for details. N: N: Severity: serious, Certainty: certain N: N: Removing /tmp/OYuNShEHYz ... I've read the debian manual 8.8 section. I think I understand what the problem is (I need to make sure that ldconfig is invoked "somewhere", possibly on a place called "posinst") but I don't know how to resolve it (i.e. where this "posinsts" file is and how should I change it). The current way of installing Io in Ubuntu is basically running sudo make install and then sudo ldconfig. Maybe the makefile should be modified so ldconfig is called from it? I don't know. Thanks a lot.

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• Make a file non-deletable in USB

  - by MegaNairda

  Somebody used my USB drive and upon returning it to me, I found a autorun.inf that is undeletable. I tried changing it's file attribute which is only H (not even set as a system file) but it keeps on saying Access Denied. The USB is set on FAT32, upon asking my friend, he told me that he uses Panda USB Vaccine http://research.pandasecurity.com/Panda-USB-and-AutoRun-Vaccine/ How do they do this? Im trying to use some Disk Sector editor but have no idea which hex file they change to make this kind of file and make it deletable again. Formatting the drive removes it, but I'm curious as to how to be able to set those kind of file attribute.

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• File io error Python

  - by serpiente

  I have a program that monitors a folder with word documents for any modifications made on the files. The error -Windows Error[2] The system cannot find the file specified- comes when I run the program, open a .doc within the folder make some changes and save it. Any suggestions on how to fix this? Here's the code: def archivar(): txt = open('archivo.txt', 'r+' ) for rootdir, dirs, files in os.walk(r"C:\Users\keinsfield\Desktop\colegio"): for file in files: time = os.stat(os.path.join(rootdir, file)).st_ctime txt.write(file +','+str(time) + '\n') def check(): txt = [col.split(',') for col in (open('archivo.txt', 'r+').read().split('\n'))] files = os.listdir(r"C:\Users\keinsfield\Desktop\colegio") for file in files: for info in txt: if info[0]==os.stat(os.path.join(r"C:\Users\keinsfield\Desktop\colegio",file)).st_ctime: print "modified"

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