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  • passenger and apache memory usage

    - by Brent Faulkner
    On a "CentOS release 6.2 (Final)" server (with Ruby 1.9.3 and Rails 3.2), and using more memory than expected. Looking at passenger-memory-stats I see a couple of HUGE httpd processes... any thoughts on how I can figure out what's going on and reduce the memory usage? Stats are included here... thanks! ---------- Apache processes ----------- PID PPID VMSize Private Name --------------------------------------- 1371 1 202.1 MB 0.1 MB /usr/sbin/httpd 4573 1371 210.2 MB 5.0 MB /usr/sbin/httpd 4778 1371 202.5 MB 0.6 MB /usr/sbin/httpd 4780 1371 217.6 MB 9.4 MB /usr/sbin/httpd 4781 1371 217.1 MB 9.1 MB /usr/sbin/httpd 4856 1371 202.4 MB 0.5 MB /usr/sbin/httpd 4863 1371 204.1 MB 2.1 MB /usr/sbin/httpd 5027 1371 202.4 MB 0.5 MB /usr/sbin/httpd 5043 1371 202.4 MB 0.4 MB /usr/sbin/httpd 5044 1371 205.5 MB 2.7 MB /usr/sbin/httpd 5072 1371 202.4 MB 0.5 MB /usr/sbin/httpd 5084 1371 202.4 MB 0.5 MB /usr/sbin/httpd 32111 1371 1297.0 MB 246.5 MB /usr/sbin/httpd 32579 1371 1914.3 MB 215.5 MB /usr/sbin/httpd ### Processes: 14 ### Total private dirty RSS: 493.42 MB -------- Nginx processes -------- ### Processes: 0 ### Total private dirty RSS: 0.00 MB ----- Passenger processes ----- PID VMSize Private Name ------------------------------- 4180 280.5 MB 24.4 MB Passenger ApplicationSpawner: /var/www/apps/people/current 4345 309.5 MB 53.4 MB Rack: /var/www/apps/people/current 4800 300.2 MB 55.2 MB Rack: /var/www/apps/people/current 4808 297.8 MB 52.5 MB Rack: /var/www/apps/people/current 4815 297.4 MB 52.4 MB Rack: /var/www/apps/people/current 4822 302.7 MB 55.6 MB Rack: /var/www/apps/people/current 22780 209.0 MB 0.0 MB PassengerWatchdog 22783 991.5 MB 1.3 MB PassengerHelperAgent 22785 113.4 MB 1.1 MB Passenger spawn server 22788 144.6 MB 0.0 MB PassengerLoggingAgent 22911 310.4 MB 64.0 MB Rack: /var/www/apps/people/current 22939 311.6 MB 53.5 MB Rack: /var/www/apps/people/current 26175 304.1 MB 55.8 MB Rack: /var/www/apps/people/current 26182 310.4 MB 44.0 MB Rack: /var/www/apps/people/current ### Processes: 14 ### Total private dirty RSS: 513.24 MB

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  • Nginx Multiple If Statements Cause Memory Usage to Jump

    - by Justin Kulesza
    We need to block a large number of requests by IP address with nginx. The requests are proxied by a CDN, and so we cannot block with the actual client IP address (it would be the IP address of the CDN, not the actual client). So, we have $http_x_forwarded_for which contains the IP which we need to block for a given request. Similarly, we cannot use IP tables, as blocking the IP address of the proxied client will have no effect. We need to use nginx to block the requested based on the value of $http_x_forwarded_for. Initially, we tried multiple, simple if statements: http://pastie.org/5110910 However, this caused our nginx memory usage to jump considerably. We went from somewhere around a 40MB resident size to over a 200MB resident size. If we changed things up, and created one large regex that matched the necessary IP addresses, memory usage was fairly normal: http://pastie.org/5110923 Keep in mind that we're trying to block many more than 3 or 4 IP addresses... more like 50 to 100, which may be included in several (20+) nginx server configuration blocks. Thoughts? Suggestions? I'm interested both in why memory usage would spike so greatly using multiple if blocks, and also if there are any better ways to achieve our goal.

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  • Can’t connect to SQL Server 2008 - looks like Shared Memory problem

    - by Proposition Joe
    I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest). I have tried restarting the SQL Server service, by the way, and also tried to get someone to log onto the machine with an admin account to restart the SQL Server service. Still no luck.

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  • Can’t connect to SQL Server 2008 - looks like Shared Memory problem

    - by user38556
    I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest). I have tried restarting the SQL Server service, by the way, and also tried to get someone to log onto the machine with an admin account to restart the SQL Server service. Still no luck.

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  • XAML C# WPF Best efficient way to do an ordered sequence of animations

    - by toni
    Hi everybody! I would like to do a sequence of animations on a label, for example, first do opacity animations from values 0 to 1 and vice versa and just at the end of opacity animation and not before a foreground animation. I would like to do it in XAML code and then start and finish de animation from C# code. Which is the best and efficient way to do it? All replies are welcome! Thanks in advance.

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  • Facade controller, is it efficient?

    - by Berlioz
    Using a facade controller pattern in .net. It seems as if though it is not efficient BECAUSE, for every event that happens in a domain object(Sales, Register, Schedule, Car) it has to be subscribed to by the controller(use case controller) and then the controller in turn has to duplicate that same event to make it available for the presentation, so that the presentation can show it to the user. Does this make sense? Please comment!

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  • Efficient way in Python to add an element to a comma-separated string

    - by ensnare
    I'm looking for the most efficient way to add an element to a comma-separated string while maintaining alphabetical order for the words: For example: string = 'Apples, Bananas, Grapes, Oranges' addition = 'Cherries' result = 'Apples, Bananas, Cherries, Grapes, Oranges' Also, a way to do this but while maintaining IDs: string = '1:Apples, 4:Bananas, 6:Grapes, 23:Oranges' addition = '62:Cherries' result = '1:Apples, 4:Bananas, 62:Cherries, 6:Grapes, 23:Oranges' Sample code is greatly appreciated. Thank you so much.

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  • How to cache queries in EJB and return result efficient (performance POV)

    - by Maxym
    I use JBoss EJB 3.0 implementation (JBoss 4.2.3 server) At the beginning I created native query all the time using construction like Query query = entityManager.createNativeQuery("select * from _table_"); Of couse it is not that efficient, I performed some tests and found out that it really takes a lot of time... Then I found a better way to deal with it, to use annotation to define native queries: @NamedNativeQuery( name = "fetchData", value = "select * from _table_", resultClass=Entity.class ) and then just use it Query query = entityManager.createNamedQuery("fetchData"); the performance of code line above is two times better than where I started from, but still not that good as I expected... then I found that I can switch to Hibernate annotation for NamedNativeQuery (anyway, JBoss's implementation of EJB is based on Hibernate), and add one more thing: @NamedNativeQuery( name = "fetchData2", value = "select * from _table_", resultClass=Entity.class, readOnly=true) readOnly - marks whether the results are fetched in read-only mode or not. It sounds good, because at least in this case of mine I don't need to update data, I wanna just fetch it for report. When I started server to measure performance I noticed that query without readOnly=true (by default it is false) returns result with each iteration better and better, and at the same time another one (fetchData2) works like "stable" and with time difference between them is shorter and shorter, and after 5 iterations speed of both was almost the same... The questions are: 1) is there any other way to speed query using up? Seems that named queries should be prepared once, but I can't say it... In fact if to create query once and then just use it it would be better from performance point of view, but it is problematic to cache this object, because after creating query I can set parameters (when I use ":variable" in query), and it changes query object (isn't it?). well, is here any way to cache them? Or named query is the best option I can use? 2) any other approaches how to make results retrieveng faster. I mean, for instance I don't need those Entities to be attached, I won't update them, all I need is just fetch collection of data. Maybe readOnly is the only available way, so I can't speed it up, but who knows :) P.S. I don't ask about DB performance, all I need now is how not to create query all the time, so use it efficient, and to "allow" EJB to do less job with the same result concerning data returning.

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  • Efficient Array Storage for Binary Tree

    - by Sundararajan S
    We have to write the nodes of a binary tree to a file. What is the most space efficient way of writing a binary tree . We can store it in array format with parent in position 'i' and its childs in 2i,2i+1. But this will waste lot of space in case of sparse binary trees.

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  • More efficient left join of big table

    - by Zeus
    Hello, I have the following (simplified) query select P.peopleID, P.peopleName, ED.DataNumber from peopleTable P left outer join ( select PE.peopleID, PE.DataNumber from formElements FE inner join peopleExtra PE on PE.ElementID = FE.FormElementID where FE.FormComponentID = 42 ) ED on ED.peopleID = P.peopleID Without the sub-query this procedure takes ~7 seconds, but with it, it takes about 3minutes. Given that table peopleExtra is rather large, is there a more efficient way to do that join (short of restructuring the DB) ?

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  • Efficient way in Python to remove an element from a comma-separated string

    - by ensnare
    I'm looking for the most efficient way to add an element to a comma-separated string while maintaining alphabetical order for the words: For example: string = 'Apples, Bananas, Grapes, Oranges' subtraction = 'Bananas' result = 'Apples, Grapes, Oranges' Also, a way to do this but while maintaining IDs: string = '1:Apples, 4:Bananas, 6:Grapes, 23:Oranges' subtraction = '4:Bananas' result = '1:Apples, 6:Grapes, 23:Oranges' Sample code is greatly appreciated. Thank you so much.

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  • WPF on a iX104 Tablet PC - efficient enough?

    - by Casimodo72
    Hi, I'm considering to use WPF for an application running on an iX104 (unfortunately I don't have one of those yet). Do you guys think that this combination would be efficient enough? Or is WPF just to slow for such a machine, so better stick with WinForms? Relevant specs of the iX104: Intel Pentium U2500 CoreDuo 2x 1.2 GHz 1 GB RAM, optional 2 GB 10.4" TFT, XGA 1024x768 Regards, Kasimier

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  • Efficient SQL to count an occurrence in the latest X rows

    - by pulegium
    For example I have: create table a (i int); Assume there are 10k rows. I want to count 0's in the last 20 rows. Something like: select count(*) from (select i from a limit 20) where i = 0; Is that possible to make it more efficient? Like a single SQL statement or something? PS. DB is SQLite3 if that matters at all...

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  • C/C++ efficient bit array

    - by aaa
    hi. Can you recommend efficient/clean way to manipulate arbitrary length bit array? right now I am using regular int/char bitmask, but those are not very clean when array length is greater than datatype length. std vector<bool> is not available for me. thanks

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  • Efficient way to store a graph for calculation in Hadoop

    - by user337499
    I am currently trying to perform calculations like clustering coefficient on huge graphs with the help of Hadoop. Therefore I need an efficient way to store the graph in a way that I can easily access nodes, their neighbors and the neighbors' neighbors. The graph is quite sparse and stored in a huge tab separated file where the first field is the node from which an edge goes to the second node in field two. Thanks in advance!

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