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• getting an exception when refreshing the configuration in memory on change to external config file

  - by RKP

  Hi, I have a windows service which reads the config settings from an external file which is located at a different path than the path to the executable for the windows service. the windows service uses a FileSystemWatcher to monitor the changes to the external config file and when it the config file is changed, it should refresh the settings in memory by reading the updated settings from the config file. but this is where I am getting an exception "ConfigurationErrorsException" and the message is "An error occurred creating the configuration section handler for appSettings: The process cannot access the file 'M:\somefolder\WindowsService1.Config' because it is being used by another process." and the inner exception is actually "IOException" with same message. here is the code. I am not sure what is wrong with the code. Please help. protected void watcher_Changed(object sender, FileSystemEventArgs e) { ConfigurationManager.RefreshSection(ConfigSectionName); WriteToEventLog(ConfigKeyCheck); if (FileChanged != null) FileChanged(this, EventArgs.Empty); } private void WriteToEventLog(string key) { if (EventLog.SourceExists(ServiceEventSource)) { EventLog.WriteEntry(ServiceEventSource, string.Format("key:{0}, value:{1}", key, ConfigurationManager.AppSettings[key])); } }

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• Memory optimization while downloading

  - by lboregard

  hello all i have the following piece of code, that im looking forward to optimize, since i'm consuming gobs of memory this routine is heavily used first optimization would be to move the stringbuilder construction out of the download routine and make it a field of the class, then i would clear it inside the routine can you please suggest any other optimization or point me in the direction of some resources that could help me with this (web articles, books, etc). i'm thinking about replacing the stringbuilder by a fixed (much larger) size buffer ... or perhaps create a larger sized stringbuilder thanks in advance. StreamWriter _writer; StreamReader _reader; public string Download(string msgId) { _writer.WriteLine("BODY <" + msgId + ">"); string response = _reader.ReadLine(); if (!response.StartsWith("222")) return null; bool done = false; StringBuilder body = new StringBuilder(256* 1024); do { response = _reader.ReadLine(); if (OnProgress != null) OnProgress(response.Length); if (response == ".") { done = true; } else { if (response.StartsWith("..")) response = response.Remove(0, 1); body.Append(response); body.Append("\r\n"); } } while (!done); return body.ToString(); }

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• Textblock doesnt get updated when rendered in memory?

  - by veechi

  I have a text block which as part of a custom control.I added the custom control as a child of grid which in turn is added as child of a Canvas.All of these contorl are instantiated in memory and are not rendered on the UI.When I update the value of the TextBlock and emboss the canvas on an image, the updated value doesnt appear on the embossed image.Here is the code snippet:- System.Windows.Controls.Canvas embossCanvas = new System.Windows.Controls.Canvas(); System.Windows.Controls.Grid grid = new Grid(); MyControl myctrl= new MyControl(); int wd = (int)myctrl.ActualWidth; int ht = (int)myctrl.ActualHeight; embossCanvas.Width = wd; embossCanvas.Height = ht; grid.Children.Add(myctrl); embossCanvas.Children.Add(grid); myctrl.txtBlk.UpdateLayout(); grid.UpdateLayout(); embossCanvas.Measure(new System.Windows.Size(embossCanvas.Width, embossCanvas.Height)); embossCanvas.Arrange(new System.Windows.Rect(0, 0, embossCanvas.Width, (int)embossCanvas.Height)); embossCanvas.UpdateLayout(); RenderTargetBitmap renderBmp = new RenderTargetBitmap(wd, ht, 96, 96, System.Windows.Media.PixelFormats.Default); renderBmp.Render(embossCanvas);

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• Datastructure choices for highspeed and memory efficient detection of duplicate of strings

  - by Jonathan Holland

  I have a interesting problem that could be solved in a number of ways: I have a function that takes in a string. If this function has never seen this string before, it needs to perform some processing. If the function has seen the string before, it needs to skip processing. After a specified amount of time, the function should accept duplicate strings. This function may be called thousands of time per second, and the string data may be very large. This is a highly abstracted explanation of the real application, just trying to get down to the core concept for the purpose of the question. The function will need to store state in order to detect duplicates. It also will need to store an associated timestamp in order to expire duplicates. It does NOT need to store the strings, a unique hash of the string would be fine, providing there is no false positives due to collisions (Use a perfect hash?), and the hash function was performant enough. The naive implementation would be simply (in C#): Dictionary<String,DateTime> though in the interest of lowering memory footprint and potentially increasing performance I'm evaluating a custom data structures to handle this instead of a basic hashtable. So, given these constraints, what would you use? EDIT, some additional information that might change proposed implementations: 99% of the strings will not be duplicates. Almost all of the duplicates will arrive back to back, or nearly sequentially. In the real world, the function will be called from multiple worker threads, so state management will need to be synchronized.

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• memory leak when removing objects in NSMutableArray

  - by user262325

  Hello everyone I hope to store MYFileObj to NSMutableArray (fileArray) and display data on an UITavleView(tableview). //----------------------------------MYFileObj #import <UIKit/UIKit.h> @interface MYFileObj : NSObject { NSString *fileName; } -(void) setFileName:(NSString *)s ; -(NSString *) fileName ; @end the array I want to store data NSMutableArray *fileArray; I created new object and add to fileArray MYFileObj *newobj=[[MYFileObj alloc] init ]; NSString *ss=[[NSString alloc] initWithFormat:@"%@",path] ; [newobj setFileName:ss]; [ss release]; [fileArray addObject:newobj]; [newobj release]; [atableview reloadData]; After the first time relaodData and do something, I want to reload fileArray and redraw atableview. //code to remove all object in atableview if([fileArray count]>0) { [fileArray removeAllObjects]; [atableview reloadData]; } I notice that there are memory leak. I hope to know the method "removeAllObjects" removes only MYFileObj themselves or also removes MYFileObj's member property "fileName"? Thanks interdev

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• which sql consumes less memory

  - by prmatta

  Yesterday I asked a question on how to re-write sql to do selects and inserts in batches. I needed to do this to try and consume less virtual memory, since I need to move millions of rows here. The object is to move rows from Table B into Table A. Here are the ways I can think of doing this: SQL #1) INSERT INTO A (x, y, z) SELECT x, y, z FROM B b WHERE ... SQL #2) FOREACH SELECT x,y,z FROM B b WHERE ... INSERT INTO A(x,y,z); END FOREACH; SQL #3) FOREACH SELECT FIRST 2000 x,y,z FROM B b WHERE ... INSERT INTO A(x,y,z); END FOREACH; SQL #4) FOREACH SELECT FIRST 2000 x,y,z FROM B b WHERE ... AND NOT EXISTS IN (SELECT * FROM A) INSERT INTO A(x,y,z); END FOREACH; Are any of the above incorrect? The database is informix 11.5.

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• Memory increases with Java UDP Server

  - by Trevor

  I have a simple UDP server that creates a new thread for processing incoming data. While testing it by sending about 100 packets/second I notice that it's memory usage continues to increase. Is there any leak evident from my code below? Here is the code for the server. public class UDPServer { public static void main(String[] args) { UDPServer server = new UDPServer(15001); server.start(); } private int port; public UDPServer(int port) { this.port = port; } public void start() { try { DatagramSocket ss = new DatagramSocket(this.port); while(true) { byte[] data = new byte[1412]; DatagramPacket receivePacket = new DatagramPacket(data, data.length); ss.receive(receivePacket); new DataHandler(receivePacket.getData()).start(); } } catch (IOException e) { e.printStackTrace(); } } } Here is the code for the new thread that processes the data. For now, the run() method doesn't do anything. public class DataHandler extends Thread { private byte[] data; public DataHandler(byte[] data) { this.data = data; } @Override public void run() { System.out.println("run"); } }

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• iPad search bar bad memory access?

  - by Geoff Baum

  Hello all, So I am trying to implement a search bar in my app and am very close but can't seem to figure out where this memory error is occurring. This is what part of my search method looks like: filters = [[NSMutableArray alloc] init]; NSString *searchText = detailSearch.text; NSMutableArray *searchArray = [[NSMutableArray alloc] init]; // Normally holds the object (ex: 70 locations) searchArray = self.copyOfFilters ; //This is the line that is breaking after ~2-3 letters are entered in the search for (NSString *sTemp in searchArray) { NSRange titleResultsRange = [sTemp rangeOfString:searchText options:NSCaseInsensitiveSearch]; if (titleResultsRange.length > 0) [filters addObject:sTemp]; } displayedFilters = filters; copyOfFilters is a deep copy of the displayed filters that appear when the view first loads via: self.copyOfFilters = [[NSMutableArray alloc] initWithArray:displayedFilters copyItems:YES]; I have traced through the entry of letters and it is accurate after 2 letters, but once you try and enter a letter after a space in the search bar, it crashes. The value of copyOfFilters = {(int)[$VAR count]} objects. Does anyone know what may be causing this? Thanks!

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• Why do I have memory problems?

  - by Tattat

  I got this error from XCode: objc[8422]: FREED(id): message release sent to freed object=0x3b120c0 I googled and find that is related to the memory. But I don't know which line of code I go wrong, any ideas? After I launch my app in simulator, it prompts a second, than, no other error except the error above. @implementation MyAppDelegate @synthesize window; @synthesize viewController; - (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after app launch [window addSubview:viewController.view]; [window makeKeyAndVisible]; [self changeScene:[MainGameMenuScene class]]; } - (void)dealloc { [viewController release]; [window release]; [super dealloc]; } - (void) changeScene: (Class) scene { BOOL animateTransition = true; if(animateTransition){ [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.5]; [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:window cache:YES]; //does nothing without this line. } if( viewController.view != nil ) { [viewController.view removeFromSuperview]; //remove view from window's subviews. [viewController.view release]; //release gamestate } viewController.view = [[scene alloc] initWithFrame:CGRectMake(0, 0, IPHONE_WIDTH, IPHONE_HEIGHT) andManager:self]; //now set our view as visible [window addSubview:viewController.view]; [window makeKeyAndVisible]; if(animateTransition){ [UIView commitAnimations]; } }

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• Memory Barrier by lock statement

  - by jalalaldeen

  I read recently about memory barrier and the reordaring issue and now I have some confusion about it. Let us have a following senario: private object _object1 = null; private object _object2 = null; private bool _usingObject1 = false; private object MyObject { get { if (_usingObject1) { return _object1; } else { return _object2; } } set { if (_usingObject1) { _object1 = value; } else { _object2 = value; } } } private void Update() { _usingMethod1 = true; SomeProperty = FooMethod(); //.. _usingMethod1 = false; } 1- At Update method; is it always _usingMethod1 = true statement excecuted before getting or setting the property? or due reordaring issue we can not garantee that? 2- Should we use volitle like. private volitle bool _usingMethod1 = false; 3- If we use lock; can we garantee then every statement within the lock will be excecuted in order like: private void FooMethod() { object locker = new object(); lock (locker) { x = 1; y = a; i++; } } Thanks in advanced..

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• Runtime Error: "Out of Memory" From Excel Macro

  - by user356180

  I have one macro, which is called when a cell change occurs. This macro selects images, deletes them, and inserts another image depending on a cell value using the following code. I have the same code for two sheets. Private Sub Worksheet_SelectionChange(ByVal Target As Range) ActiveSheet.Shapes.SelectAll Selection.Delete 'insert image code here. End Sub In one sheet, it's working perfectly fine and deletes all images, while in the other sheet, it gives me the runtime error "Out of Memory" and highlights the following line: ActiveSheet.Shapes.SelectAll Can anyone tell me why this is happening? It works perfectly fine in one and not in the other. One other thing I want to tell you is it was working fine when I gave this Excel macro to my client; both sheets were working fine. Suddenly after 2 days, he started getting the error on one sheet on which he was working a lot. I don't know why this is happening. Can anyone tell me what's the reason for this and how I can solve it?

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• runtime error "out of memory"+excel macro

  - by user356180

  hi experts. i have one macro,which i called when cell change. this macro select images and delete them and insert another image depending on cell value using following code. i have same code for two sheets. Private Sub Worksheet_SelectionChange(ByVal Target As Range) ActiveSheet.Shapes.SelectAll Selection.Delete 'insert image code here. End Sub in one sheet its working perfectly fine and delete all images while in other sheet , it give me runtime error "out of memory" and highlight following line. ActiveSheet.Shapes.SelectAll can any one tell me why this is happening? it works perfectly fine in one and not in other. one other thing i want to tell you is. it was working fine when i gave this macro excel to my client,both sheets were working fine, suddenly after 2 days, he started getting error on one sheet on which he was working lot. dont know why this is happening. can anyone tell me whats reason and how to solved it?

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• selected option not clearing from memory android

  - by user2980560

  I have a small random number spinner that when you click gives a random number. I am having two problems. The first is when the main activity loads it displays a random number on the screen without the random number spinner being clicked. I am unsure what to set to false to keep it from opening with the main activity. The second problem is that when you select an option from the spinner it does not clear. Meaning that If you click on option D6 or D20 then you can not click on the same option again until selecting the other option first. Essentially the selection does not clear out of memory after the random number is selected. Here is the random number code public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { Random rand = new Random(); int roll; // An item was selected. if (spinner1.getSelectedItemPosition()==0) { roll = rand.nextInt(6)+1; } else { roll = rand.nextInt(20)+1; } // Put the result into a string. String text = "You rolled a " + roll; // Build a dialog box and with the result string and a single button AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(text).setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // do things when the user clicks ok. } }); AlertDialog alert = builder.create(); // Show the dialog box. alert.show(); }

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• Wondering about a way to conserve memory in C# using List<> with structs

  - by Michael Ryan

  I'm not even sure how I should phrase this question. I'm passing some CustomStruct objects as parameters to a class method, and storing them in a List. What I'm wondering is if it's possible and more efficient to add multiple references to a particular instance of a CustomStruct if a equivalent instance it found. This is a dummy/example struct: public struct CustomStruct { readonly int _x; readonly int _y; readonly int _w; readonly int _h; readonly Enum _e; } Using the below method, you can pass one, two, or three CustomStruct objects as parameters. In the final method (that takes three parameters), it may be the case that the 3rd and possibly the 2nd will have the same value as the first. List<CustomStruct> _list; public void AddBackground(CustomStruct normal) { AddBackground(normal, normal, normal); } public void AddBackground(CustomStruct normal, CustomStruct hover) { AddBackground(normal, hover, hover); } public void AddBackground(CustomStruct normal, CustomStruct hover, CustomStruct active) { _list = new List<CustomStruct>(3); _list.Add(normal); _list.Add(hover); _list.Add(active); } As the method stands now, I believe it will create new instances of CustomStruct objects, and then adds a reference of each to the List. It is my understanding that if I instead check for equality between normal and hover and (if equal) insert normal again in place of hover, when the method completes, hover will lose all references and eventually be garbage collected, whereas normal will have two references in the List. The same could be done for active. That would be better, right? The CustomStruct is a ValueType, and therefore one instance would remain on the Stack, and the three List references would just point to it. The overall List size is determined not by the object Type is contains, but by its Capacity. By eliminating the "duplicate" CustomStuct objects, you allow them to be cleaned up. When the CustomStruct objects are passed to these methods, new instances are created each time. When the structs are added to the List, is another copy made? For example, if i pass just one CustomStruct, AddBackground(normal) creates a copy of the original variable, and then passes it three times to Addbackground(normal, hover, active). In this method, three copies are made of the original copy. When the three local variables are added to the List using Add(), are additional copies created inside Add(), and does that defeat the purpose of any equality checks as previously mentioned? Am I missing anything here?

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• apache eats up too much ram per child

  - by mrc4r7m4n

  Hello to everyone. I've got fallowing problem: Apache eat to many ram per child. The fallowing comments shows: cat /etc/redhat-release -- Fedora release 8 (Werewolf) free -m: total used free shared buffers cached Mem: 3566 3136 429 0 339 1907 -/+ buffers/cache: 889 2676 Swap: 4322 0 4322 I know that you will say that there is nothing to worry about because swap is not use, but i think it's not use for now. 3.httpd -v: Server version: Apache/2.2.14 (Unix) 4.httpd -l: Compiled in modules: core.c mod_authn_file.c mod_authn_default.c mod_authz_host.c mod_authz_groupfile.c mod_authz_user.c mod_authz_default.c mod_auth_basic.c mod_include.c mod_filter.c mod_log_config.c mod_env.c mod_setenvif.c mod_version.c mod_ssl.c prefork.c http_core.c mod_mime.c mod_status.c mod_autoindex.c mod_asis.c mod_cgi.c mod_negotiation.c mod_dir.c mod_actions.c mod_userdir.c mod_alias.c mod_rewrite.c mod_so.c 5.List of loaded dynamic modules: LoadModule authz_host_module modules/mod_authz_host.so LoadModule include_module modules/mod_include.so LoadModule log_config_module modules/mod_log_config.so LoadModule setenvif_module modules/mod_setenvif.so LoadModule mime_module modules/mod_mime.so LoadModule autoindex_module modules/mod_autoindex.so LoadModule vhost_alias_module modules/mod_vhost_alias.so LoadModule negotiation_module modules/mod_negotiation.so LoadModule dir_module modules/mod_dir.so LoadModule alias_module modules/mod_alias.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule proxy_module modules/mod_proxy.so LoadModule cgi_module modules/mod_cgi.so 6.My prefrok directive <IfModule prefork.c> StartServers 8 MinSpareServers 5 MaxSpareServers 25 ServerLimit 80 MaxClients 80 MaxRequestsPerChild 4000 </IfModule> KeepAliveTimeout 6 MaxKeepAliveRequests 100 KeepAlive On 7.top -u apache: ctrl+ M top - 09:19:42 up 2 days, 19 min, 2 users, load average: 0.85, 0.87, 0.80 Tasks: 113 total, 1 running, 112 sleeping, 0 stopped, 0 zombie Cpu(s): 7.3%us, 15.7%sy, 0.0%ni, 75.7%id, 0.0%wa, 0.7%hi, 0.7%si, 0.0%st Mem: 3652120k total, 3149964k used, 502156k free, 348048k buffers Swap: 4425896k total, 0k used, 4425896k free, 1944952k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16956 apache 20 0 700m 135m 100m S 0.0 3.8 2:16.78 httpd 16953 apache 20 0 565m 130m 96m S 0.0 3.7 1:57.26 httpd 16957 apache 20 0 587m 129m 102m S 0.0 3.6 1:47.41 httpd 16955 apache 20 0 567m 126m 93m S 0.0 3.6 1:43.60 httpd 17494 apache 20 0 626m 125m 96m S 0.0 3.5 1:58.77 httpd 17515 apache 20 0 540m 120m 88m S 0.0 3.4 1:45.57 httpd 17516 apache 20 0 573m 120m 88m S 0.0 3.4 1:50.51 httpd 16954 apache 20 0 551m 120m 88m S 0.0 3.4 1:52.47 httpd 17493 apache 20 0 586m 120m 94m S 0.0 3.4 1:51.02 httpd 17279 apache 20 0 568m 117m 87m S 16.0 3.3 1:51.87 httpd 17302 apache 20 0 560m 116m 90m S 0.3 3.3 1:59.06 httpd 17495 apache 20 0 551m 116m 89m S 0.0 3.3 1:47.51 httpd 17277 apache 20 0 476m 114m 81m S 0.0 3.2 1:37.14 httpd 30097 apache 20 0 536m 113m 83m S 0.0 3.2 1:47.38 httpd 30112 apache 20 0 530m 112m 81m S 0.0 3.2 1:40.15 httpd 17513 apache 20 0 516m 112m 85m S 0.0 3.1 1:43.92 httpd 16958 apache 20 0 554m 111m 82m S 0.0 3.1 1:44.18 httpd 1617 apache 20 0 487m 111m 85m S 0.0 3.1 1:31.67 httpd 16952 apache 20 0 461m 107m 75m S 0.0 3.0 1:13.71 httpd 16951 apache 20 0 462m 103m 76m S 0.0 2.9 1:28.05 httpd 17278 apache 20 0 497m 103m 76m S 0.0 2.9 1:31.25 httpd 17403 apache 20 0 537m 102m 79m S 0.0 2.9 1:52.24 httpd 25081 apache 20 0 412m 101m 70m S 0.0 2.8 1:01.74 httpd I guess thats all information needed to help me solve this problem. I think the virt memory is to big, the same res. The consumption of ram is increasing all the time. Maybe it's memory leak because i see there is so many static modules compiled. Could someone help me with this issue? Thank you in advance. 8.ldd /usr/sbin/httpd linux-gate.so.1 => (0x0012d000) libm.so.6 => /lib/libm.so.6 (0x0012e000) libpcre.so.0 => /lib/libpcre.so.0 (0x00157000) libselinux.so.1 => /lib/libselinux.so.1 (0x0017f000) libaprutil-1.so.0 => /usr/lib/libaprutil-1.so.0 (0x0019a000) libcrypt.so.1 => /lib/libcrypt.so.1 (0x001b4000) libldap-2.3.so.0 => /usr/lib/libldap-2.3.so.0 (0x001e6000) liblber-2.3.so.0 => /usr/lib/liblber-2.3.so.0 (0x00220000) libdb-4.6.so => /lib/libdb-4.6.so (0x0022e000) libexpat.so.1 => /lib/libexpat.so.1 (0x00370000) libapr-1.so.0 => /usr/lib/libapr-1.so.0 (0x00391000) libpthread.so.0 => /lib/libpthread.so.0 (0x003b9000) libdl.so.2 => /lib/libdl.so.2 (0x003d2000) libc.so.6 => /lib/libc.so.6 (0x003d7000) /lib/ld-linux.so.2 (0x00110000) libuuid.so.1 => /lib/libuuid.so.1 (0x00530000) libresolv.so.2 => /lib/libresolv.so.2 (0x00534000) libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0x00548000) libssl.so.6 => /lib/libssl.so.6 (0x00561000) libcrypto.so.6 => /lib/libcrypto.so.6 (0x005a6000) libgssapi_krb5.so.2 => /usr/lib/libgssapi_krb5.so.2 (0x006d9000) libkrb5.so.3 => /usr/lib/libkrb5.so.3 (0x00707000) libcom_err.so.2 => /lib/libcom_err.so.2 (0x0079a000) libk5crypto.so.3 => /usr/lib/libk5crypto.so.3 (0x0079d000) libz.so.1 => /lib/libz.so.1 (0x007c3000) libkrb5support.so.0 => /usr/lib/libkrb5support.so.0 (0x007d6000) libkeyutils.so.1 => /lib/libkeyutils.so.1 (0x007df000) Currently i cant restart the apache. I work in a company and now there is rush hours. I will do that about 5 pm. Current top -u apache: shift + M top - 12:31:33 up 2 days, 3:30, 1 user, load average: 0.73, 0.80, 0.79 Tasks: 114 total, 1 running, 113 sleeping, 0 stopped, 0 zombie Cpu(s): 3.3%us, 4.7%sy, 0.0%ni, 90.0%id, 1.3%wa, 0.3%hi, 0.3%si, 0.0%st Mem: 3652120k total, 3169720k used, 482400k free, 353372k buffers Swap: 4425896k total, 0k used, 4425896k free, 1978688k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16957 apache 20 0 708m 145m 117m S 0.0 4.1 2:11.32 httpd 16956 apache 20 0 754m 142m 107m S 0.0 4.0 2:33.94 httpd 16955 apache 20 0 641m 136m 103m S 5.3 3.8 1:58.37 httpd 17515 apache 20 0 624m 131m 99m S 0.0 3.7 2:03.90 httpd 16954 apache 20 0 627m 130m 98m S 0.0 3.6 2:13.87 httpd 17302 apache 20 0 625m 124m 97m S 0.0 3.5 2:10.80 httpd 17403 apache 20 0 624m 114m 91m S 0.0 3.2 2:08.85 httpd 16952 apache 20 0 502m 114m 81m S 0.0 3.2 1:23.78 httpd 16186 apache 20 0 138m 61m 35m S 0.0 1.7 0:15.54 httpd 16169 apache 20 0 111m 49m 17m S 0.0 1.4 0:06.00 httpd 16190 apache 20 0 126m 48m 24m S 0.0 1.4 0:11.44 httpd 16191 apache 20 0 109m 48m 19m S 0.0 1.4 0:04.62 httpd 16163 apache 20 0 114m 48m 21m S 0.0 1.4 0:09.60 httpd 16183 apache 20 0 127m 48m 23m S 0.0 1.3 0:11.23 httpd 16189 apache 20 0 109m 47m 17m S 0.0 1.3 0:04.55 httpd 16201 apache 20 0 106m 47m 17m S 0.0 1.3 0:03.90 httpd 16193 apache 20 0 103m 46m 20m S 0.0 1.3 0:10.76 httpd 16188 apache 20 0 107m 45m 18m S 0.0 1.3 0:04.85 httpd 16168 apache 20 0 103m 44m 17m S 0.0 1.2 0:05.61 httpd 16187 apache 20 0 118m 41m 21m S 0.0 1.2 0:08.50 httpd 16184 apache 20 0 111m 41m 19m S 0.0 1.2 0:09.28 httpd 16206 apache 20 0 110m 41m 20m S 0.0 1.2 0:11.69 httpd 16199 apache 20 0 108m 40m 17m S 0.0 1.1 0:07.76 httpd 16166 apache 20 0 104m 37m 18m S 0.0 1.0 0:04.31 httpd 16185 apache 20 0 99.3m 36m 16m S 0.0 1.0 0:04.16 httpd as you can see the memory usage growing up from e.g. res( 135 to 145)m and it will be growing up till memory ends. Are you sure that this option i set up: <IfModule prefork.c> StartServers 8 MinSpareServers 5 MaxSpareServers 25 ServerLimit 80 MaxClients 80 MaxRequestsPerChild 4000 </IfModule> KeepAliveTimeout 6 MaxKeepAliveRequests 100 KeepAlive On are correct? Maybe i should decrease some of them? Another questions that bother me: I got e.g. static module mod_negotiation.c compiled into apache and the same module loaded as dynamic. Is this normal that i've loaded duplicated module. But when i want to remove dynamic module(mod_negotiation.c) from httpd.conf and then restart apache error appears. Now I cant tell this error message because i cant restart apache :( Hello again:) This is memory usage just after restart apache: top - 16:19:12 up 2 days, 7:18, 3 users, load average: 1.08, 0.91, 0.91 Tasks: 109 total, 2 running, 107 sleeping, 0 stopped, 0 zombie Cpu(s): 17.0%us, 25.7%sy, 51.0%ni, 4.7%id, 0.0%wa, 0.3%hi, 1.3%si, 0.0%st Mem: 3652120k total, 2762516k used, 889604k free, 361552k buffers Swap: 4425896k total, 0k used, 4425896k free, 2020980k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 13569 apache 20 0 93416 43m 15m S 0.0 1.2 0:02.55 httpd 13575 apache 20 0 98356 38m 16m S 32.3 1.1 0:02.55 httpd 13571 apache 20 0 86808 33m 12m S 0.0 0.9 0:02.60 httpd 13568 apache 20 0 86760 33m 12m S 0.0 0.9 0:00.81 httpd 13570 apache 20 0 83480 33m 12m S 0.0 0.9 0:00.51 httpd 13572 apache 20 0 63520 5916 1548 S 0.0 0.2 0:00.02 httpd 13573 apache 20 0 63520 5916 1548 S 0.0 0.2 0:00.02 httpd 13574 apache 20 0 63520 5916 1548 S 0.0 0.2 0:00.02 httpd 13761 apache 20 0 63388 5128 860 S 0.0 0.1 0:00.01 httpd 13762 apache 20 0 63388 5128 860 S 0.0 0.1 0:00.01 httpd 13763 apache 20 0 63388 5128 860 S 0.0 0.1 0:00.00 httpd I will try to compile apache from source to newest version. Thx for help guys.

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• Very large database, very small portion most being retrieved in real time

  - by mingyeow

  Hi folks, I have an interesting database problem. I have a DB that is 150GB in size. My memory buffer is 8GB. Most of my data is rarely being retrieved, or mainly being retrieved by backend processes. I would very much prefer to keep them around because some features require them. Some of it (namely some tables, and some identifiable parts of certain tables) are used very often in a user facing manner How can I make sure that the latter is always being kept in memory? (there is more than enough space for these) More info: We are on Ruby on rails. The database is MYSQL, our tables are stored using INNODB. We are sharding the data across 2 partitions. Because we are sharding it, we store most of our data using JSON blobs, while indexing only the primary keys

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• Why isn´t linux using all the available memory

  - by Devator

  I have a linux VPS which has 256 MB of memory (free only finds 248 though). However it seems I still have 85 MB free, but it's swapping for 255 MB. Why is this? free -m total used free shared buffers cached Mem: 248 245 3 0 41 40 -/+ buffers/cache: 163 85 Swap: 1971 255 1716

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• kmemsize problems in VPS even when there is about 500MB free mem

  - by Amer

  Hello, I have a site hosted on a Plesk VPS with 512MB memory and keep on getting kmemsize in "black zone" QoS errors. The soft limit of kmemsize is 12,288,832 and hard limit is 13,517,715. The definition Virtuozzo gives is: Size of unswappable memory, allocated by the operating system kernel. What's eating up the kmemsize? Is there any way to reconfigure and increase the kmemsize? The servers barely have any load or processing. Thanks for the help...

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• Memory and CPU optimizers: Are they gimmicks?

  - by dotnetdev

  Are tools which analyse which enable you to use all your CPU cores and also tools which help you to regain memory (can't think of any just yet but seen plenty) a gimmick? Do these tools really work?

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• CentOS only detecting 50% of ram

  - by Devator

  I have 16GB ram in my machine. Before, free -m outputted the normal 16 GB ram, however now (after a reboot) it only detects 8 GB ram. Is one ram module damaged? grep -i memory /var/log/dmesg outputs Memory: 15621184k/16017200k available (2535k kernel code, 387120k reserved, 1748k data, 196k init). (Which looks like 16 GB to me). Free -m outputs: total used free shared buffers cached Mem: 7484 7415 68 0 6104 524 -/+ buffers/cache: 786 6697 Swap: 2055 0 2054 Anything I might be missing? Thanks in advance.

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• Why does my computer slow down after being on too long?

  - by RoboShop

  I'm sure everyone has experienced it - if you leave a computer on too long, every once in a while, it needs a fresh reboot. I have a laptop, and I only hibernate it, but every week or two, I'm going to need to restart otherwise it will just slow down (usually when windows update makes me restart) I was wondering though... why? What are some of the things that occur that eat up memory that can seemingly not be freed unless I reboot the OS. In addition, are there any programs I can get that can free up this memory and keep the computer alive for longer? Preferably for windows 7.

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• Monitor RAM usage on CentOS and restart Apache at a certain usage

  - by Chris

  Hi, I'm running a CentOS 5.3 server with a basic LAMP stack. I've optimized LAMP and my code to run efficiently as possible, but Apache has a memory leak somewhere that kills my server every hour or so. What is the best way to write a script that will monitor the memory usage and if it peaks over, say, 450MB kill all the Apache processes and restart Apache. I know C++/PHP and basic Linux server administration but I'm not familiar with Perl or bash scripting. I'd be open to learn any solutions, though, as a temporary solution while I find the issue.

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• Mac OS X web server memory depletion issues

  - by Ali

  I have a Mac mini ram 4GB setup as a web server which has low traffic - it is running single WordPress instance and a forum. Why is available memory dropping to ~20MB after a while, bringing the whole server down? I see httpd processes climbing more and more, and the only thing I can do is to restart the server and everything will work fine again. Anybody with the same issues to share their thought about this?

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• CPU, Memory, Network, IO resources are under utilized when I tried various JMeter load testing

  - by Jaiganesh

  CPU, Memory, Network, IO resources are under utilized when I tried various JMeter load testing. I have given below the details. Hardware: 1 Core with 2 GB RAM OS: Ubuntu 12.04 LTS Server Edition Application: PHP (using JQuery, Ajax) JMeter Parameters: 10, 20, 30, 40 Hits per minute 220 Test Cases per hit 2.03 MB per hit I am not clear, why these resources are under utilized. Please help me to resolve this.

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• Run script when a specific disk/memory card is mounted under OSX

  - by Max Rydahl Andersen

  How do I run a script when a drive is mounted under OSX ? My usecase is that I would like to automatically copy images from my USB memory/harddrive when it is inserted in my USB card reader, and when a DVD or CD is inserted I would like to copy it for storage in my media center. I've tried using Marcopolo but from what I can see it can only detect the presence of a certain USB device, not the presence of specific harddrive. (http://superuser.com/questions/65127/is-it-possible-to-run-an-automator-workflow-when-a-usb-device-is-connected)

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