2
votes
2answers
44 views

Lots of major page faults in CentOS

We have a fairly complicated PHP script that's generating a lot of minor and major page faults. $> ps -o min_flt,maj_flt,time,cmd,pid 4686 MINFL MAJFL TIME CMD ...
2
votes
3answers
242 views

Mysql crashing, oom-killer, out of memory, tuning issues?

I just moved all of my websites to a new server with 4GB RAM. Almost immediately, mysql started crashing, and at one point, didn't reboot which caused a major outage (since I didn't notice until ...
1
vote
1answer
64 views

can Iowait cause significant RAM consumption increase

I have a node.js process running continuously on a linux EC2 instance, it extracts data and stores it in mysql. Some reads are also performed on the database. The process can run well during hours or ...
0
votes
1answer
106 views

Trading Engine running on RHEL 5.x [closed]

Before asking question quick background about myself working at one of trading company this is my 1st job as sysadmin I have finish my RHCE no experience how production server work. In our company ...
3
votes
2answers
112 views

Can more memory than I need slow down my server?

We're about to install a memory intensive application and will purchase a server for it. The server will have at least 4 CPUs, with multiple cores. While the application is memory intensive, the ...
1
vote
3answers
482 views

slow website load and high memory usage

my site has been slowed down last couple of days ... some image doesn't show up ... i got 408 Request Time-out: Server timeout waiting for the HTTP request from the client couple of times which ...
0
votes
1answer
1k views

Apache consuming too much CPU and memory

I am having some troubles with CPU loading an memory with Apache Web Server. We are running a Ubuntu Server 12.04 LTS on a Virtual Machine. Our server have the following specs: 8GB RAM; 4 vCPUs ...
2
votes
1answer
372 views

Should CPU usage be so low while memory usage is high on heavy mysql server?

I'm using ubuntu server 12.04 x64. The server receives a lot of requests to mysql through apache web server (it's light interface). From mysql stats I see there is approx 250 queries / second from 8 ...
0
votes
1answer
230 views

-XX:MaxNewSize and other JVM parameter setting in AIX

All, I am trying to adjust our application's memory settings: JVM and Heap adjustments. I also came across -XX:MaxNewSize parameter. Our application runs on a AIX machine which has ample RAM (100+ ...
0
votes
1answer
23 views

One Slower/Larger VS Two Faster/Smaller RAM [closed]

Generally speaking, performance-wise, which one is the best (putting brands aside)? 1x 8GB 1333MHz RAM or 2x 4GB 2400MHz RAM Both DDR3.
0
votes
0answers
277 views

How to avoid Memory “Hard Fault/sec”

i've a problem on my windows 2008 server x64, and i cannot understand how can i solve it. i'm looking to Resource Monitor and see about 100 to 200 hard faults/sec. and generally the machine is slow. ...
-2
votes
4answers
372 views

will a 100GB database with large tables on MSSQL 2008 server run on a 3GB RAM system? [duplicate]

This will be only for testing and developing. I have a 100 GB DB I am working on and need a sanbox envorinment. The only hardware I have is a desktop with 3GB and 32bit. I am able to install SQL 2008 ...
-1
votes
1answer
90 views

Choosing linux server for mysql - memory clock speed [duplicate]

I have a Linux Mysql server cluster where master and slaves are overloaded by a combination of read/write i/o and by SELECT queries load. We purchased FusionIO cards to replace the hard drives. My ...
2
votes
2answers
727 views

About huge page and translation Lookaside Buffer

they confuse me. huge page: the way to manage physical memory of OS kernel, it is split huge page by kernel for reduce the index number in page table. I get it from : ...
2
votes
2answers
1k views

Changing memory allocator to Jemalloc Centos 6

After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run ...
-1
votes
2answers
554 views

How Can I Maximize Apache Performance on my Server - Need Calculations Please [closed]

I have a Sun T5140 server with 8GB of memory and two 4-core T-Series CPU's (128 max threads). This server is a dedicated web server. Based on the premise that I'm willing to allocate 1/2 of the ...
0
votes
1answer
733 views

Very high Magento/Apache memory usage even without visitors (are we fooled by our hosting company?)

I am no server guy and we have issues with our speed so I come here asking for advise. We have a VPS with 2 cores and 2gb of RAM at a Magento specialized hosting company. Over the course of the last ...
2
votes
5answers
491 views

What should I do with all my free ram? [closed]

I have a weird kind of problem. I host a small webshop, it´s nothing big perhaps 20 visitors per day and a few orders per week. I will probably expand it a bit but I doubt it will grow very large. ...
2
votes
1answer
73 views

Decreasing MySQL ram usage

MySQL is using 150MB of my RAM memory when it's doing nothing. I have a VPS with only 256 MB ram available, so what can I do to decrease its RAM usage?
5
votes
1answer
386 views

AMD 24 core server memory bandwidth

I need some help to determine whether the memory bandwidth I'm seeing under Linux on my server is normal or not. Here's the server spec: HP ProLiant DL165 G7 2x AMD Opteron 6164 HE 12-Core 40 GB RAM ...
0
votes
1answer
73 views

Rule of thumb in RAM estimate for static pages? [duplicate]

Possible Duplicate: How do you do Load Testing and Capacity Planning for Web Sites I've seen tutorials saying they can run decent websites on 64MB RAM (Debian/Lighttpd/PHP/MySQL) however ...
-1
votes
1answer
133 views

Page Fault of 1,000,000 in 64 GB RAM Server [closed]

I have a 64 bit Machine that runs SQL Server. It has 64 GB RAM. It is giving around 1,000,000 Page Faults per second. Is it OK or it is giving too many Page Faults? if the number is hign the what ...
1
vote
1answer
1k views

MySQL on Linux out of memory

OS: Redhat Enterprise Linux Server Release 5.3 (Tikanga) Architecture: Intel Xeon 64Bit MySQL Server 5.5.20 Enterprise Server advanced edition. Application: Liferay. My database size is 200MB. RAM ...
-1
votes
1answer
184 views

Cache Total Entries increase and decrease as a delta shape. Why?

My performance counter "cache total entries" "cache total hits" "cache total misses" keeps increasing and decreasing as a delta shape around every 1 hour.The decreasing is much fast than increasing. ...
3
votes
2answers
1k views

How can I check if my DB needs more RAM?

How would you check if your postgresql DB instance needs more RAM memory to handle their current working data?
2
votes
3answers
2k views

Very high CPU and low RAM usage - is it possible to place some of swap some of the CPU usage to the RAM (with CloudLinux LVE Manager installed)?

I had to install CloudLinux so that I could somewhat controle the CPU ussage and more importantly the Concurrent-Connections the Websites use. But as you can see the Server load is way to high and ...
7
votes
1answer
7k views

How should I tune apache when I see high CPU, but low memory usage?

My CentOS web nodes (LAMP stack) are experiencing high CPU usage but low memory usage. Nearly all of the processes are apache. I know I could just add additional web nodes until my cpu usage becomes ...
0
votes
1answer
110 views

php: Does memory_limit setting influence running time / speed?

If I increase php memory_limit could that increase the speed of a process? Or if there is more memory allowed than needed the extra resource will not be used by the system to increase speed of the ...
1
vote
2answers
617 views

Does lshw list the “factory” speed of a memory module or the effective speed and how to find the former?

I hope I phrased this correctly. lshw gives: description: DIMM Synchronous 400 MHz (2.5 ns) product: M378B5773CH0-CH9 vendor: Samsung physical id: 0 slot: ...
-3
votes
6answers
1k views

How to make a huge ram drive?

At my old job when a report was needed I could sit down with someone and pull up results and get immediate feedback, and then refine my queries and ultimately have the data we needed, in the format we ...
-3
votes
1answer
261 views

How can detect the count of page fault on windows OS? [closed]

How can detect the count of page fault on windows 2008 or windows 7? in the next process is it possible detect the best RAM for system (system is dedicated server on the web)? thanks a lot
1
vote
2answers
214 views

How do you control which portion of SQL Database gets loaded into Server Memory?

My SQL Server Machine has 6GB of RAM but the database size is 20GB. The Database is mainly an events log, clustered-indexed by time. The clients are mostly interested in the latest data. They want ...
26
votes
9answers
5k views

To improve SQL performance, why not just put lots of RAM rather than having faster hard disks?

People keep telling me that in order to improve an SQL server's performance, buy the fastest hard disks possible with RAID 5, etc. So I was thinking, instead of spending all the money for ...
0
votes
2answers
488 views

Tuning Apache memory usage

I've been working on on getting my webserver in check and I'm running into some issues. First of all, using top I've noticed that Apache is using a lot of memory, no surprise really, but 130-150M per ...
11
votes
2answers
11k views

Best Mysql cache settings for 8gb RAM dedicated mysql server using only Innodb (5gb database)

I'm a pretty big noob when it comes to setting up mysql for performance. And honestly I'm not worried about the fine tuning to squeeze every last bit of performance out of mysql, but I do know that ...
-1
votes
1answer
116 views

Cl 6 vs Cl 9 In a Poweredge r710

I have a Dell Poweredge R710. Right now it has 12 2GB, Cl=6 (per SIW), dual ranked, PC3-8500 RDIMMs running in Advanced ECC mode. I'd like to add 24 additional GBs. I found this: ...
0
votes
1answer
136 views

Server RAM: effect on performance and applications

What is basic the effect of RAM on the performance on web-server running CentOS? As far as I know, if my applications are utilizing only 1.5 GB of RAM and I increase my server RAM to 4GB then also ...
0
votes
2answers
2k views

Why does Sonatype Nexus seem to be taking up a ton of memory and CPU time?

Running nexus on Amazon Linux on my SC2 instance. Clean install, then I built a small project against it. Not being used by anyone but me. When I first start Nexus, CPU utilization starts out at ...
0
votes
1answer
290 views

Figuring out memory hogging process in a Linux centos machine

I have a micro instance of Centos AMI from EC2 to run my dev instances. Applications keep on blowing off due to memory issues. How can I find out process that are taking memory and take decisions ...
10
votes
3answers
10k views

Why is Apache running so many processes? Excessive RAM here?

I notice Apache is running multiple processes on my LAMP server (ubuntu 10.10). I'm just running a Wordpress site with MySQL as a database. It seems like www-data is running apache2 more than it ...
1
vote
1answer
772 views

What are the memory limits for IIS 7.0 app pools on x86 server

I have the Windows Server 2008 SP2 EE x86 with a 6GB of memory. There are 10 apps pools working on IIS7. How much memory can use all 10 apps pools and each app pool separately? What are the limits on ...
4
votes
1answer
970 views

Does equal RAM size sticks yield bettter performance?

Is it important to have all the ram sticks with an equal memory size? I was told that upgrading our server from 64GB (8 x 8GB) to 72GB (7x 8GB + 1x 16GB) will not yield any performance gain, since ...
0
votes
1answer
55 views

Optimal hosting of website and platform api on EC2

We intend to deploy a web site (based on Drupal) and the associated platform api on Amazon EC2. Would like to know what would be a better way to architect this solution w.r.t to instances (meaning ...
0
votes
3answers
183 views

finding the bottleneck

I have a process running that is opening TIF files. Each TIF file is just one regular page and they are maybe 100 kB each. Every time he opens a TIF file it tries to read a barcode in a specific area ...
1
vote
2answers
267 views

RAM Size vs Speed

I have a server with 4 DDR2 RAM slots. I just bought 2x2GB 800MHz sticks for it, for a total of 4GB RAM. I also have 2x512MB 677MHz sticks left over. Is it better to use the 2x2GB sticks at 800MHz ...
2
votes
1answer
109 views

Is it Good to place Windows Server paging files on seperate fast storage?

How much of an impact does the performance of the storage system hosting the paging files of windows machines (I guess both physical or virtual instances like VMWare / KVM / Xen / Whatever)?
1
vote
1answer
615 views

Is linux kernel 2.6.37 80% slower than 2.6.34 using memory & threads?

If I run the command time perl -e 'use threads; $T=12 ; foreach (1..$T) { $thr[$i++] = threads->create(sub { printf "I am thread %s\n", threads->tid(); foreach (1..9e6) { push(@a, ...
3
votes
3answers
8k views

How to create a RAM Drive (RAM Disk) in Windows 2008 R2?

There are lots of tools for creating RAM drives. None of them seem to work for windows 2008 R2. Does anyone know if this is possible and if so how. Does anyone know of a tool that does work? I've ...
1
vote
1answer
919 views

How to use most of memory available on MySQL

I've got a MySQL server which has both InnoDB and MyISAM tables. InnoDB tablespace is quite small under 4 GB. MyISAM is big ~250 GB in total of which 50 GB is for indexes. Our server has 32 GB of RAM ...
1
vote
3answers
256 views

Why RAM usage is much bigger than Virtual Memory usage

I am running some tests on a very powerful machine ( 24GB RAM, Window 2008 64bit ) I checked my task manager: Physical memory: 98% ( RAM is 24GB ) But the totally "Memory(Private working set)" usage ...