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  • Do Websites Work?

    A website should, from brochure ware sites through to e-business and e-commerce sites, engage and enable users to interact, transact and share knowledge online. I could quote many statistics about website usage, e-business, e-commerce models and search engine marketing etc, but I won't.

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  • What to Look For in a Free Website SEO Builder

    If you have an online business, you need to get higher rankings on major search engines. Major search engines like Google and Yahoo are used by many potential customers and according to statistics, if your online business is not on the first few pages in search engines, it will most likely fail.

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  • What does "kTriangles/s" mean in hardware graphics benchmark reports?

    - by swquinn
    I've looked around and found several sites offering benchmarking statistics for mobile platforms and I've been seeing the unit of measure as "kTriangles/s". Originally I misread this, missing the 'k'; does this translate to "thousand(s) of triangles/s", e.g.: 8902 kTriangles/s = 8,902,000 triangles/s (I'm pretty sure that my interpretation is correct, but I hope someone can confirm this for me) Thanks!

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  • Learn Easy Search Engine Optimization - Off Page

    It is estimated that nearly 84% of the traffic generated on a particular site (mainly blogs) come from the search engines' results. Therefore it is important that you improve your articles 'searched' statistics and ensure that your page is amongst the top of any search engine result.

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  • Detecting Hyper-Threading state

    - by jchang
    To interpret performance counters and execution statistics correctly, it is necessary to know state of Hyper-Threading. In principle, at low overall CPU utilization, for non-parallel execution plans, it should not matter whether HT is enabled or not. Of course, DBA life is never that simple. The state of HT does matter at high over utilization and in parallel execution plans depending on the DOP. SQL Server does seem to try to allocate threads on distinct physical cores at intermediate DOP (DOP less...(read more)

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  • Detecting Hyper-Threading state

    - by jchang
    To interpret performance counters and execution statistics correctly, it is necessary to know state of Hyper-Threading. In principle, at low overall CPU utilization, for non-parallel execution plans, it should not matter whether HT is enabled or not. Of course, DBA life is never that simple. The state of HT does matter at high over utilization and in parallel execution plans depending on the DOP. SQL Server does seem to try to allocate threads on distinct physical cores at intermediate DOP (DOP less...(read more)

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  • The 5 Most Important Analytics Stats

    While there are hundreds of different uses for a website analytics program, there are some that can quickly indicate whether your website has a heartbeat. Most likely providing these statistics would satisfy a customer asking how the website is doing, and for a customer that doesn't have analytics on their website, the potential to have these metrics should be enough to convince the customer that they need to install website analytics.

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  • Annotate over Multi-table Inheritance in Django

    - by user341584
    I have a base LoggedEvent model and a number of subclass models like follows: class LoggedEvent(models.Model): user = models.ForeignKey(User, blank=True, null=True) timestamp = models.DateTimeField(auto_now_add=True) class AuthEvent(LoggedEvent): good = models.BooleanField() username = models.CharField(max_length=12) class LDAPSearchEvent(LoggedEvent): type = models.CharField(max_length=12) query = models.CharField(max_length=24) class PRISearchEvent(LoggedEvent): type = models.CharField(max_length=12) query = models.CharField(max_length=24) Users generate these events as they do the related actions. I am attempting to generate a usage-report of how many of each event-type each user has caused in the last month. I am struggling with Django's ORM and while I am close I am running into a problem. Here is the query code: ef usage(request): # Calculate date range today = datetime.date.today() month_start = datetime.date(year=today.year, month=today.month - 1, day=1) month_end = datetime.date(year=today.year, month=today.month, day=1) - datetime.timedelta(days=1) # Search for how many LDAP events were generated per user, last month baseusage = User.objects.filter(loggedevent__timestamp__gte=month_start, loggedevent__timestamp__lte=month_end) ldapusage = baseusage.exclude(loggedevent__ldapsearchevent__id__lt=1).annotate(count=Count('loggedevent__pk')) authusage = baseusage.exclude(loggedevent__authevent__id__lt=1).annotate(count=Count('loggedevent__pk')) return render_to_response('usage.html', { 'ldapusage' : ldapusage, 'authusage' : authusage, }, context_instance=RequestContext(request)) Both ldapusage and authusage are both a list of users, each user annotated with a .count attribute which is supposed to represent how many particular events that user generated. However in both lists, the .count attributes are the same value. Infact the annotated 'count' is equal to how many events that user generated, regardless of type. So it would seem that my specific authusage = baseusage.exclude(loggedevent__authevent__id__lt=1) isn't excluding by subclass. I have tried id_lt=1, id_isnull=True, and others. Halp.

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  • Scala Interpreter scala.tools.nsc.interpreter.IMain Memory leak

    - by Peter
    I need to write a program using the scala interpreter to run scala code on the fly. The interpreter must be able to run an infinite amount of code without being restarted. I know that each time the method interpret() of the class scala.tools.nsc.interpreter.IMain is called, the request is stored, so the memory usage will keep going up forever. Here is the idea of what I would like to do: var interpreter = new IMain while (true) { interpreter.interpret(some code to be run on the fly) } If the method interpret() stores the request each time, is there a way to clear the buffer of stored requests? What I am trying to do now is to count the number of times the method interpret() is called then get a new instance of IMain when the number of times reaches 100, for instance. Here is my code: var interpreter = new IMain var counter = 0 while (true) { interpreter.interpret(some code to be run on the fly) counter = counter + 1 if (counter > 100) { interpreter = new IMain counter = 0 } } However, I still see that the memory usage is going up forever. It seems that the IMain instances are not garbage-collected by the JVM. Could somebody help me solve this issue? I really need to be able to keep my program running for a long time without restarting, but I cannot afford such a memory usage just for the scala interpreter. Thanks in advance, Pet

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  • Help, my CentOS servers keep going down , No route to host after a random uptime [closed]

    - by user249071
    Hello , I have a couple of Centos linux servers, that have a very simple task, they run nginx + fastcgi for php , and some NFS mounts between them, readonly They have some RPC commands to start some downloading processes with wget, nothing fancy , from a main server, but their behavior is very unstable, they simply go down, we tried to monitor ram , processor usage, even network connections, they don't load up so much, max network connections up to... 250 max, 15% processor usage and memory , well, doesn't even fill up, 2.5GB from 8GB max , I have no ideea why can a linux server go down like that, they aren't even public servers, no domain names installed no public serving, for sites. The only thing that I've discovered was that if i didn't restart the network service every couple of hours or so... the servers were becoming very slow, starting apps very slow, but not repoting a high usage of resources...Maybe Centos doesn't free the timeout connections, or something like that...It's based on Red Hat right? I'm not a linux expert , but I'm sure that there are a few guys out there that can easily have an answer to this , or even have some leads to what i can do ... I haven't installed snort, or other things to view if we have some DOS attacks, still the scheduled script that restarts the network each hour should put the system back online, and it doesn't.... Thank you in advance

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  • Adding Mysql Columns in Rails Rake

    - by Gigg
    I have a rake file that does a series of calculations on a database. Basically it adds usage on equipment regularly. At the end of the day it needs to add that days total to a monthly total table and update that same table. i use the following simple concepts: To get data from the database is pretty simple: @usages = Usage.find(:all) time = Time.new for usage in @usages sql = ActiveRecord::Base.connection To insert it into the database: sql.execute "INSERT (or UPDATE) into usages ## add values and options as per MySQL But how do I: take a column from a database, add all of its values together that have a common value in another column, (i.e. if column x == value y) and then insert it into another column in another table, say dailyusages? I have tried these options: task (:monthly => :environment) do @dailyusages = Dailyusage.find(:all) for dailyusage in @dailyusages sql = ActiveRecord::Base.connection time = Time.new device = monthlyusages.device month = time.month if device == dailyusages.device ##&& month == dailyusages.month total = (dailyusage.total.sum.to_i) @monthlyusages = Monthlyusage.find(:all) for monthlyusage in @monthlyusages sql = ActiveRecord::Base.connection old_total = monthlyusage.total.to_i new_total = (old_total + total) sql.execute "UPDATE monthlyusages ( year, month, total, device ) values('#{time.year}', '#{time.month}', '#{total}', '#{dailyusage.device}' )" end I obviously have uncommented options and tried all sorts of things. Any help would really save me a load of trouble. Thanks in advance. (** BTW - I am new to rails, so go easy on me **)

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  • Using CGContextDrawTiledImage at different zooms causes massive memory growth

    - by Jacques
    I'm working on app an where there's a view in a zoomable UIScrollView. When the user zooms in or out, I redraw the view that's in the UIScrollView to be nice and sharp. That view has a background image that I draw with CGContextDrawTiledImage. I noticed that memory usage grows every time I switch to a new zoom level. It looks like CGContextDrawTiledImage keeps a cache somewhere of the image scaled to different sizes. So, If I go from 1.0 to 1.1x zoom, memory use grows. Going back to 1.0 doesn't cause it to grow, but then going to 1.05 and then 1.2 causes it to grow twice. Back to 1.1 and no growth. Of course, the zoom level is under user control so I don't have control over how many zoom levels happen. Right now my background image is kind of massive (512x512), so this causes memory usage to grow very quickly. It doesn't show up as a memory leak in Instruments, just additional allocations that never get freed. I've tried to find a way to free the cache that appears to be being created, but no luck. It doesn't seem to respond to low memory warnings, for example. I also tried setting the view's backgroundColor to a UIColor created with colorWithPatternImage, but that doesn't work because I'm doing the scaling by changing the graphics context's CTM, not by setting the view's transform. Any ideas on how to keep memory usage from blowing up?

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  • C Programming. How to deep copy a struct?

    - by user69514
    I have the following two structs where "child struct" has a "rusage struct" as an element. Then I create two structs of type "child" let's call them childA and childB How do I copy just the rusage struct from childA to childB? typedef struct{ int numb; char *name; pid_t pid; long userT; long systemT; struct rusage usage; }child; typedef struct{ struct timeval ru_utime; /* user time used */ struct timeval ru_stime; /* system time used */ long ru_maxrss; /* maximum resident set size */ long ru_ixrss; /* integral shared memory size */ long ru_idrss; /* integral unshared data size */ long ru_isrss; /* integral unshared stack size */ long ru_minflt; /* page reclaims */ long ru_majflt; /* page faults */ long ru_nswap; /* swaps */ long ru_inblock; /* block input operations */ long ru_oublock; /* block output operations */ long ru_msgsnd; /* messages sent */ long ru_msgrcv; /* messages received */ long ru_nsignals; /* signals received */ long ru_nvcsw; /* voluntary context switches */ long ru_nivcsw; /* involuntary context switches */ }rusage; I did the following, but I guess it copies the memory location, because if I changed the value of usage in childA, it also changes in childB. memcpy(&childA,&childB, sizeof(rusage)); I know that gives childB all the values from childA. I have already taken care of the others fields in childB, I just need to be able to copy the rusage struct called usage that resides in the "child" struct.

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  • SQL Compact performance on device

    - by Ben M
    My SQL Compact database is very simple, with just three tables and a single index on one of the tables (the table with 200k rows; the other two have less than a hundred each). The first time the .sdf file is used by my Compact Framework application on the target Windows Mobile device, the system hangs for well over a minute while "something" is done to the database: when deployed, the DB is 17 megabytes, and after this first usage, it balloons to 24 megs. All subsequent usage is pretty fast, so I'm assuming there's some sort of initialization / index building going on during this first usage. I'd rather not subject the user to this delay, so I'm wondering what this initialization process is and whether it can be performed before deployment. For now, I've copied the "initialized" database back to my desktop for use in the setup project, but I'd really like to have a better answer / solution. I've tried "full compact / repair" in the VS Database Properties dialog, but this made no difference. Any ideas? For the record, I should add that the database is only read from by the device application -- no modifications are made by that code.

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  • parse a special xml in python

    - by zhaojing
    I have s special xml file like below: <alarm-dictionary source="DDD" type="ProxyComponent"> <alarm code="402" severity="Alarm" name="DDM_Alarm_402"> <message>Database memory usage low threshold crossed</message> <description>dnKinds = database type = quality_of_service perceived_severity = minor probable_cause = thresholdCrossed additional_text = Database memory usage low threshold crossed </description> </alarm> ... </alarm-dictionary> I know in python, I can get the "alarm code", "severity" in tag alarm by: for alarm_tag in dom.getElementsByTagName('alarm'): if alarm_tag.hasAttribute('code'): alarmcode = str(alarm_tag.getAttribute('code')) And I can get the text in tag message like below: for messages_tag in dom.getElementsByTagName('message'): messages = "" for message_tag in messages_tag.childNodes: if message_tag.nodeType in (message_tag.TEXT_NODE, message_tag.CDATA_SECTION_NODE): messages += message_tag.data But I also want to get the value like dnkind(database), type(quality_of_service), perceived_severity(thresholdCrossed) and probable_cause(Database memory usage low threshold crossed ) in tag description. That is, I also want to parse the content in the tag in xml. Could anyone help me with this? Thanks a lot!

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  • how to create an object using self?

    - by Nick
    I thought I understood the use of self while referring to anything in the current class. After encountering this warning and subsequent run failure, I have googled many variants of "define self" or "usage of self" and gotten nowhere. This problem is how to create an object without the warning, and understand why. #import <Cocoa/Cocoa.h> @interface Foo : NSObject { Foo *obj; } -(void)beta; @end #import "Foo.h" @implementation Foo -(void)beta{ obj = [self new]; // 'Foo' may not respond to '-new' } @end Note, if I substitute Foo for self, there's no problem. I thought the class name and self were equivalent, but obviously the compiler doesn't think so. Perhaps an explanation of what's wrong here will not only solve my problem but also enlighten my understanding of the usage of self. Are there any tutorials about proper usage of self? I couldn't find anything beyond something like "self is the receiver of the message," which I didn't help me at all.

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  • What's the point of indicating AllowMultiple=false on an abstract Attribute class?

    - by tvanfosson
    On a recent question about MVC attributes, someone asked whether using HttpPost and HttpDelete attributes on an action method would result in either request type being allowed or no requests being allowed (since it can't be both a Post and a Delete at the same time). I noticed that ActionMethodSelectorAttribute, from which HttpPostAttribute and HttpDeleteAttribute both derive is decorated with [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)] I had expected it to not allow both HttpPost and HttpDelete on the same method because of this, but the compiler doesn't complain. My limited testing tells me that the attribute usage on the base class is simply ignored. AllowMultiple seemingly only disallows two of the same attribute from being applied to a method/class and doesn't seem to consider whether those attributes derive from the same class which is configured to not allow multiples. Moreover, the attribute usage on the base class doesn't even preclude your from changing the attribute usage on a derived class. That being the case, what's the point of even setting the values on the base attribute class? Is it just advisory or am I missing something fundamental in how they work? FYI - it turns out that using both basically precludes that method from ever being considered. The attributes are evaluated independently and one of them will always indicate that the method is not valid for the request since it can't simultaneously be both a Post and a Delete.

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  • VB.Net Memory Issue

    - by Skulmuk
    We have an application that has some interesting memory usage issues. When it first opens, the program uses aroun 50-60MB of memory. This stays consistent on 32-bit machines. On 64-bit machines, however, re-activating the form in any way (clicking, dragging, alt-tabbing, etc.) adds around another 50MB to it's memory usage. It repeats this process several times before resetting back to around 45MB, at which point the cycle begins again. I've done some research and a lot of people have said that VB in general has pretty poor garbage collection, which could be affecting the software in some way. However, I've yet to find a solution. There are no events fired when the application is activated (as shown by 32-bit usage) - the applications is merely sitting awaiting the user's actions. At load, the system pulls some data into a tree view, but that's the only external connection, and it only re-fires the routine when the user makes a change to something and saves the change. Has anyone else experienced anything this strange, and if so, does anyone know of what might fix it? It seems strange that it only occurs under x64 systems. Thanks

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  • IPv6: Can't ping anything - "Operation not permitted"

    - by Matthew Iselin
    I've been working on getting IPv6 support into my network, and had everything working properly for a short while. The server is running Ubuntu Server 8.10. Now however whenever I attempt to do anything related to IPv6 on the server, I get "Operation not permitted". This is coming from things like wide-dhcpv6-client (when trying to get an IPv6 address from the ISP) and radvd - both log errors of this type into syslog. Even pinging the loopback interface fails: xxx@gordon:~$ ping6 ::1 PING ::1(::1) 56 data bytes ping: sendmsg: Operation not permitted ping: sendmsg: Operation not permitted ping: sendmsg: Operation not permitted ^C --- ::1 ping statistics --- 3 packets transmitted, 0 received, 100% packet loss, time 2014ms xxx@gordon:~$ sudo ping6 ::1 sudo: unable to resolve host gordon PING ::1(::1) 56 data bytes ping: sendmsg: Operation not permitted ping: sendmsg: Operation not permitted ping: sendmsg: Operation not permitted ^C --- ::1 ping statistics --- 3 packets transmitted, 0 received, 100% packet loss, time 2014ms As you can see, I have attempted pinging as root, as most of the material I've found on the internet points to a permission problem. However, that has not helped. Any hints to getting unstuck would be appreciated.

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  • monitoring a /21 for potential bad guys with snort and port mirroring

    - by Adeodatus
    Hi all, I want/need to start monitoring our network a bit better. Its an odd network in that it comprises 2 /22 public IPs and a slew of private admin IPs. I do have one point in the network where it all comes together and I can turn on port mirroring on the catalyst. From that port, I'd like to turn up a box running various utilities. Snort is high on my list but it'd be nice to also get some networking statistics with something like Netflow. So, what are peoeple's thoughts. I can turn up a box needed for this with a bit of ease. We have the hardware available. What should I run? I'd love to know what kind of nasty things are potentially going on but I'd also like to see statistics on what people are doing on the network so I can better tweak our systems to handle it better and improve performance. I'm open so please, give me some ideas to go along with what I've got.

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  • Windows 7 machine, can't connect remotely until after ping

    - by rjohnston
    I have a Windows 7 (Home Premium) machine that doubles as a media centre and subversion server. There's a couple of problems with this setup, when connecting to the server from an XP (SP3) machine: Firstly, the machine won't respond to it's machine name until after it's IP address has been pinged. Here's an example: Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:\Documents and Settings\Rob>ping damascus Ping request could not find host damascus. Please check the name and try again. C:\Documents and Settings\Rob>ping 192.168.1.17 Pinging 192.168.1.17 with 32 bytes of data: Reply from 192.168.1.17: bytes=32 time=2ms TTL=128 ... Ping statistics for 192.168.1.17: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1ms, Maximum = 2ms, Average = 1ms C:\Documents and Settings\Rob>ping damascus Pinging damascus [192.168.1.17] with 32 bytes of data: Reply from 192.168.1.17: bytes=32 time<1ms TTL=128 .... Ping statistics for 192.168.1.17: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 1ms, Average = 0ms C:\Documents and Settings\Rob> Likewise, subversion commands with either the machine name or IP address will fail until the machine's IP address is pinged. Occasionally, the machine won't respond to pings on it's IP address, it'll just come back with "Request timed out". The svn server is VisualSVN, if that helps... Any ideas?

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  • Installing mod_pagespeed (Apache module) on CentOS

    - by Sid B
    I have a CentOS (5.7 Final) system on which I already have Apache (2.2.3) installed. I have installed mod_pagespeed by following the instructions on: http://code.google.com/speed/page-speed/download.html and got the following while installing: # rpm -U mod-pagespeed-*.rpm warning: mod-pagespeed-beta_current_x86_64.rpm: Header V4 DSA signature: NOKEY, key ID 7fac5991 [ OK ] atd: [ OK ] It does appear to be installed properly: # apachectl -t -D DUMP_MODULES Loaded Modules: ... pagespeed_module (shared) And I've made the following changes in /etc/httpd/conf.d/pagespeed.conf Added: ModPagespeedEnableFilters collapse_whitespace,elide_attributes ModPagespeedEnableFilters combine_css,rewrite_css,move_css_to_head,inline_css ModPagespeedEnableFilters rewrite_javascript,inline_javascript ModPagespeedEnableFilters rewrite_images,insert_img_dimensions ModPagespeedEnableFilters extend_cache ModPagespeedEnableFilters remove_quotes,remove_comments ModPagespeedEnableFilters add_instrumentation Commented out the following lines in mod_pagespeed_statistics <Location /mod_pagespeed_statistics> **# Order allow,deny** # You may insert other "Allow from" lines to add hosts you want to # allow to look at generated statistics. Another possibility is # to comment out the "Order" and "Allow" options from the config # file, to allow any client that can reach your server to examine # statistics. This might be appropriate in an experimental setup or # if the Apache server is protected by a reverse proxy that will # filter URLs in some fashion. **# Allow from localhost** **# Allow from 127.0.0.1** SetHandler mod_pagespeed_statistics </Location> As a separate note, I'm trying to run the prescribed system tests as specified on google's site, but it gives the following error. I'm averse to updating wget on my server, as I'm sure there's no need for it for the actual module to function correctly. ./system_test.sh www.domain.com You have the wrong version of wget. 1.12 is required.

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  • Is it possible to trace the delegation path for a DNS lookup?

    - by Josh Glover
    I'm trying to determine why a Nagios host check is failing (hostnames and IPs have been changed to protect the guilty): : jmglov@laurana; host www.foo.com ;; connection timed out; no servers could be reached : jmglov@laurana; for ns in `grep -o '\([0-9]\+[.]\)\{3\}[0-9]\+$' /etc/resolv.conf`; do ping -qc 1 $ns; done PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 10.911/10.911/10.911/0.000 ms PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data. --- 192.168.1.2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.241/0.241/0.241/0.000 ms So I know that my nameservers are reachable, meaning that some nameserver along the delegation path to the authoritative nameserver for my host is not responding. Is there an easy way to determine which nameserver this is (basically a traceroute for DNS)?

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