Performance tuning is the process of modifying a system to improve its efficiency. This is also known as optimizing.

learn more… | top users | synonyms

1
vote
2answers
1k views

How to preserve sysprep from changing Default User settings

I'm having diffculties configuring 20 new Dell Vostro minis here. I set up one of them with my preferred OS, applications and settings, especially the Visual Effects Settings of Windows XP. I set them ...
1
vote
2answers
367 views

How do I objectively measure an application's load on a server

All, I'm not even sure where to begin looking for resources to answer my question, and I realize that speculation about this kind of thing is highly subjective. I need help determining what class of ...
1
vote
1answer
489 views

postgresql - cache preferences per table/db

i'm curious if there is any way to hint postgresql which data should be more likely cached in memory. in my scenario the server would be handling mostly read traffic, whole data-set is much larger ...
1
vote
4answers
2k views

Lower Maximum Possible Memory Usage

I've been using MySQLTuner to optimize my database, and the only problem I am having is: [!!] Maximum possible memory usage: 14.8G (126% of installed RAM) I'm not sure what I should be ...
1
vote
1answer
3k views

How to change the SWAP file disk in Mac OS X?

I have moved my system on andexternal Raid 1 enclosure attachet to my iMac through Firewire 800 (the best an iMac can do ;-( ) ... I'd like to move the swap on the internal disk in order to increase ...
1
vote
1answer
2k views

Slow performance due to txg_sync for ZFS 0.6.3 on Ubuntu 14.04

I am using native ZFS with "ZFS on Linux" installed from the PPA here. Setup was not a problem and I am using it in mirrored configuration with two WD 4TB Red HDDs. Unfortunately I am having ...
1
vote
1answer
776 views

Apache Start Servers, Min/Max Spare Servers Ram Consumption Influence

I have a 1gb ram VPS. If I stop apache I have 400 mb ram free. So the max clients should be (total ram - used ram) / max_service_ram_consumption = 400 / 31. So MaxClients should be 13. These are the ...
1
vote
3answers
2k views

NFS Over OpenVPN: Top Performance Boosters

I have two VPS's - One is running 2008 Server R2 and the other is a Ubuntu 12.04 installation. I am using the Windows VPS for RD sessions for Quickbooks and a couple other apps and using the Ubuntu ...
1
vote
2answers
961 views

Troubleshooting poor disk IO performance

Note that while this question is a little Redis-specific, the main problem is generic: a process takes so much HDD IO write bandwidth that other processes can't write anything. We've got an Ubuntu VM ...
1
vote
1answer
1k views

How do change the max IO request size on Windows Server 2008 R2

As I understand it Windows Server 2008 R2 has the ability to send IO requests to the storage subsystem of up to 1MB in size. Back in the Server 2003 era (and before) this used to be limited to 64KB. ...
1
vote
3answers
2k views

Strategy to optimize raid cache

HP SmartArray have "Accelerator Ratio: XX% Read / YY% Write", that configures how much cache ram dedicated for read, and how much for write. Is there way to find best proportion on alive server in ...
1
vote
1answer
772 views

How Do I Troubleshoot Exim Mail Retry Issues?

My server is encountering high CPU load (like almost pegged at 100%) so much that the Apache service can't run and we get Apache 500 errors. We used a script to catch this and this is where we ...
1
vote
1answer
2k views

Windows Server 2008 File Server Performance Tuning

I am running a Microsoft Windows Server 2008 R2 File Server on our network. It seems that there are many times where accessing the data from the server is really slow, sluggish, or non-responsive. ...
1
vote
2answers
782 views

Establish a performance baseline for terminal server windows machines

I need to establish a performace basline for our Terminal Server machines. i plan to use perfmon , and will have a SCOM server on the site very soon. The terminals are used as a desktop environment ...
1
vote
2answers
917 views

How to tune down the Hyperic built-in postgresql database for a small setup

We are testing out Hyperic 4.5.1 in a quite small environment for now. Currently there are just 1-5 agents and there probably won't be any more than 10-15. When I run ps ax there are 20(!) postgres ...
1
vote
2answers
1k views

Apache Config for High Page View, Long Session Users - KeepAlive and MaxRequest variables

I am currently running a web app that sees several (~15) users logging in once each day, and then leaving the web app open where it automatically refreshes with new content every 5 minutes. Each user ...
1
vote
2answers
2k views

Further Performance Tuning on Medium SharePoint Farm?

I figured I would post this here, since it may be related more to the server configuration than the SharePoint configuration or a combination of both? I'm open for ideas to try, or even feedback on ...
1
vote
2answers
184 views

mysql settings - using the available resources

I've got a lot of processing work I need to run on a mysql server. I've installed mysql 5.1.45-community on a Win 2008 64bit. Its running on a Xeon, 3ghz 6 processors with 8 gig ram. It doesn't ...
1
vote
2answers
384 views

Is there any way to exclude specific files / directories from SuperFetch?

Overall, I love the SuperFetch feature in Vista and believe it results in hugely noticeable gains in the launch time and overall "snappiness" of the system. However, sometimes it apparently gets ...
1
vote
0answers
23 views

How to track down bad performance on an api-server

If my api-server shows bad performance, such as high cpu - can this be blamed on the service or on the server? If a regular app-server shows bad performance, all I can do is track down the methods ...
1
vote
0answers
9 views

Maximum Network throughput for SWIFT storage

I have a SWIFT cluster deployed as part of Openstack which is currently giving me a max throughput of 95 MBS(Megabytes per second). There are 6 proxy servers and 6 storage nodes with replication ...
1
vote
0answers
62 views

Advice Tuning my server

as many others I Learn many info from you in the past and now I manage to run server independently , now I am new to sql tuning and I been searching around the web a while now and tuning seems to be a ...
1
vote
2answers
62 views

PHP5-FPM pm.max_children affect RAM or CPU+RAM?

Recently inherited a Nginx+PHP5-FPM server, and I'm learning and trying to optimize PHP5-FPM settings. Server info: 4 CPUs (8 threads) 7.5 GiB RAM PHP5-FPM info: pm.max_children = 5 ...
1
vote
0answers
84 views

Performance issues with cross-drive NTFS junctions

I have the following setup: Windows 8.1 32-bit Drive 0: system drive, SSD, NTFS, mounted at C:\ Drive 1: data drive, magnetic HDD, NTFS, mounted at C:\Users\Database User\Documents and Z:\ ...
1
vote
0answers
78 views

Multipath tcp application level performance measurement

I am working on a project related to Multipath tcp and I want to measure the goodput and the RTT at the application level. I don't want to use a traditional tool(netperf, iperf, ...) and I want to ...
1
vote
0answers
68 views

IRQ not handled by all CPUs

I have a problem about balancing irq. I took irq numbers from /etc/interrupts and assigned each irq to each of 24 CPUs as this tutorial says for i in {143..166};do cat /proc/irq/${i}/smp_affinity; ...
1
vote
1answer
350 views

KVM Slow performance on XP Guest

The system is very slow to do anything, even browse a local folder, and CPU sits at 100% frequently. Guest is XP 32 bit. Host is Scientific Linux 6.2, Libvirt 0.10, Guest XP OS shows ACPI ...
1
vote
1answer
267 views

TCP RWIN, MSS and MTU [closed]

I have been doing some reading into TCP Receive Window (RWIN), Maximum Segment Size (MSS) and Maximum Transmission Unit (MTU). Right off the bat I have some questions and I need a power user's help! ...
1
vote
0answers
372 views

Copying cause big iowait

I have dedicated server with 3 HDD. System disk, backup disk (same as system disk) and data disk. When I copy lot of data with cp (say, between backup disk and data disk) load average goes sky high. ...
1
vote
0answers
94 views

Getting the virtual memory address for (major) page faults

On a Linux (Cent OS 5) system, I have a process that accesses a large amount of memory mapped files. The process is generating a large amount of page faults because the aggregated size of the mapped ...
1
vote
0answers
257 views

Can I tune my Debian KVM server to benefit my Windows guest?

Debian Squeeze KVM server with Win2k8 server guest. The server has 16GBs of RAM and the guest only runs MS SQL, with a 15GB database on it. I am wondering if there is anything I can tune from the ...
1
vote
1answer
997 views

NGinx vs Varnish as a reverse proxy in front of Apache w/php [closed]

I am using apache with mod_php to serve content. Mostly the content is fetched form memcache over the network. All of my images, css and js are already on a cdn What are the pros and cons of putting ...
1
vote
0answers
444 views

server benchmarking with apache benchmark

We are testing one of our production server with ab and what we found is apr_socket_recv: Connection timed out (110) Total of 176 requests completed after some time above output.That means the ...
1
vote
2answers
531 views

Solaris: Increase TCP's Initial Congestion Window to 10 segments (tcp slow-start)

How can the Initial Congestion Window be increased to 10? It seems it can be done with TCP_INIT_CWND, but I don't know how to do that.
1
vote
1answer
491 views

Why is MySQL table_cache full but never used

I have been using the tuning-primer.sh script to tune my my.cnf settings. I have most things working well but the part about TABLE CACHE makes no sense: TABLE CACHE Current table_cache value = 900 ...
1
vote
1answer
2k views

AIX network parameters to close TCP sockets of unplugged devices

We have an AIX box, running what we call in banking "ATM Switch" not the ATM networking switch, but the bank ATM driver. where we have some ATM machines connected to two server processes. The problem ...
1
vote
1answer
1k views

apache and ajp performance

I have an apache sitting in front of two tomcat app servers(one on the same physical server, the other on a different one) that does time consuming work(0.5 sec to 10sec per request). The apache http ...
1
vote
1answer
162 views

Tuning Linux TCP for large number of TIME_WAIT

It looks like we have a bunch of tcp connections hanging around on a busy webserver, this is the output from ss -s: Total: 366 (kernel 1037) TCP: 72108 (estab 130, closed 71964, orphaned 0, synrecv ...
1
vote
1answer
207 views

4096 and 8192 block size read slower than write? by using lsi 9361-8i RAID10

is it possible that 1024 and 2048 block size read speed is faster than 4096 and 8192 block? I'm using lsi 9361-8i with RAID 10 , with 8 x Kingston E50 250G. result: 1024 = Write: 2,251 MB/s ...
0
votes
4answers
337 views

Trying to scale my dedicated server for high traffic

I have a quad core xeon, 8GB ram, and only 2 x 1TB SATA drives right now. I am trying to figure out how to scale my application to handle as much load and traffic per day as possible. I have an ...
0
votes
4answers
274 views

Exchange 2003 I/O Troubles

We have some internal processes that send email to our Exchange 2003 system (on Win2K3 R2 32bit). Recently they have been intermittently failing with various errors -- boiled down they report ...
0
votes
1answer
300 views

PCIe SSD vs SSD vs SAS - which is best for Database?

Since I am going on shipping soon I wonder which generally will mostly boost the database performance ? The bridge question is - which will boost mostly a database which having a lot of random block ...
0
votes
4answers
516 views

Increase application performance on Amazon AWS

I've got a client with an MVC v1 (.NET) application running on a micro instance. On this instance, I've got .NET, IIS 7.5, and MS SQL Server 2008 running to handle the application. The client has ...
0
votes
3answers
947 views

Increase the performance of sort command on a multi-processor Sun Solaris box

I have a bunch of (rather large i.e. >100MB) comma separated files which needs sorting on 4 processor box with SunOS 5.10 Sort appears to run rather slow (minutes) I am wondering if there is any way ...
0
votes
3answers
2k views

Faster Option: Redirect via PHP to PHP or Apache mod rewrite redirect to PHP?

I want to determine if using Apache's .htaccess mod rewrite is a faster way to redirect to a PHP file, compared to redirecting from one PHP file to another, using the header redirect core function of ...
0
votes
1answer
33 views

Before buying it, how can I tell if a storage array makes certain performance counters available over SNMP?

I've noticed that documentation for SNMP reporting that is built-in to devices (i.e. doesn't need an agent running in an OS) usually doesn't include a list of performance counters that are available ...
0
votes
1answer
166 views

Trade reliability for speed in a slow filesystem

On my box running Ubuntu Server 11.10 I have a rather slow soft RAID6 array on four USB sticks (and no other means for persistent storage). I want a faster filesystem on that box. I'm OK if I'd lose ...
0
votes
2answers
42 views

how to find the highest IO consumer on a disk? [closed]

Can some one help to find highest IO consumer on each individual disks? i.e Which process consumes the most IO on /dev/sda, the highest IO consumer on /dev/sdb etc.
0
votes
2answers
1k views

How to turn linux to keep 'cache' high?

We are running a heavy service on Debian. Our service generates lots of file i/o and its performance relies on how well Linux kernel caches files. Our system has 64GB memory. Total file size is 500GB ...
0
votes
2answers
4k views

How can I configure Apache to use more of my CPU?

Apache threads are stacking up on one of my web servers (300-500 simultaneous requests, some taking 3-8s to process!), but CPU usage is very low (~10%). Page load time is slowing way down as a ...