0
votes
1answer
51 views

Ignore utm_* values with varnish?

Can I 'ignore' query string variables before pulling matching objects from the cache, but not actually remove them from the URL to the end-user? For example, all the marketing utm_source, ...
3
votes
1answer
89 views

iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?

The partition is in RAID1 using software RAID. Command line used: iozone -s 190g -r 300k -O -b test_file OPS Mode. Output is in operations per second. ...
0
votes
1answer
215 views

htcacheclean doesn't seem to be cleaning the cache

I'm running mod_cache with apache 2 on a fairly high traffic'd site. I've set the htcacheclean to run in demon mode every 10 minutes to keep the cache at 4GB. It's currently at 15GB and doesn't seem ...
1
vote
0answers
32 views

How do I reduce server load for a dormant WordPress site using W3 Total Cache?

My current host who did all performance optimization for me has jacked up their price to $1,000/month, so I was forced to move to a new host. The new host charges only $150/month. They give you W3 ...
4
votes
3answers
811 views

Let varnish send old data from cache while it's fetching a new one?

I'm caching dynamically generated pages (PHP-FPM, NGINX) and have varnish in front of them, this works very well. However, once the cache timeout is reached, I see this: new client requests page ...
1
vote
0answers
109 views

Stunnel + Varnish + Apache questions

I am currently running Varnish in front of apache for all http traffic. I added stunnel so as to take advantage of the cache for https connections as well. So, for https, stunnel talks to varnish ...
0
votes
1answer
298 views

Varnish: Exclude section of page

Is there any way to exclude some webpage parts from cache? For example, I have Recent Additions block on my homepage which gets refreshed after every 15mins. I know there is something like ESI ...
0
votes
1answer
203 views

Caching all files in varnish

I want my varnish servers to cache all files. At backend there is lighttpd hosting only static files, and there is an md5 in the url in case of file change, ex. ...
0
votes
1answer
581 views

Is it advisable to put eAccelerator cache dir to RAM?

I've just installed eaccelerator on server that's gonna be running Magento. I have a hard disk, so was wondering would my server performance improve if I was to mount eaccelerator cache dir to RAM. ...
-1
votes
1answer
175 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. ...
0
votes
2answers
1k views

How often should I clear the OpenX cache directory?

OpenX creates many small php files in /openx/var/cache. After some time, the amount of files is so big that it has an impact on server performance (the amount of files was so big that listing the ...
7
votes
2answers
3k views

High disk I/O when cache is used?

A few days ago I noticed a disk I/O wait and disk activity drop (which was great). Then I also notice that my cache was full(*) and fragmented. Then I flushed cache. After that, disk latency and disk ...
3
votes
1answer
297 views

My server doesn't seem to be caching anything well

I have a VPS from tocici (via BuildYourVPS). It's got 4 GB of RAM (2 GB of it "burst" RAM). This server has some severe performance issues, however. First, a quick explanation of what this server ...
5
votes
2answers
696 views

Linux disable disk cache for a single command

Our server is performing decently, but when backups or other scan processes run it will tank the entire server. Something like clamd will run and scan many files. While we expect slow performance, ...
0
votes
1answer
402 views

Does anyone use dm-cache?

Has, or does, anyone use dm-cache - specifically for caching SAN based storage locally? I'm looking for a way to speed up SAN based storage on a CentOS 5.6 + XEN Hypervisor which uses iSCSI mounted ...
2
votes
4answers
1k views

Building a High Performance Static Website

I'm looking to build a High Performance website. It has thousands of static HTML pages, that are specifically rendered depending on a form submit. I have a ruby script that generates these static HTML ...
1
vote
1answer
753 views

How to prevent the slow first load startup for a website?

I'm sure you've noticed that for many servers, the website loading time is quite long if you're the first visitor for a couple of hours. Do you have any idea why this is the case (is it just server ...
1
vote
2answers
2k views

How do I see if my disk cache is disabled on Linux?

I have an ubuntu linux virtual machine here and I think there is no disk cache. For example this is the output from free -m: total used free shared buffers ...
2
votes
1answer
562 views

Recommended technology for layered disk cache in linux

I originally asked this on superuser but it occurs to me it's more more of a server topic. I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and ...
1
vote
3answers
237 views

How to calculate actual gain from CDN?

I'm testing out a new CDN service (http://cloudflare.com), and I'm trying to figure out if it is giving much of a gain. I have a very fast internet connection so I can't see any increase in speed ...
4
votes
2answers
2k views

ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with ...
1
vote
1answer
321 views

Linux Cache Clear for Storage Performance Testing

Is there any way to make linux remove from memory all cached disk data? Our goal is to time some performance tests on various storage configurations and have each one start with a clean slate ...
2
votes
1answer
530 views

SQL Server buffer cache versus Windows disk cache

I've read about SQL Server buffer cache and various discussions about tuning it, using the Maximum and Minimum Memory settings. But I have a doubt: the operational system has a disk reading cache too. ...
2
votes
2answers
988 views

Per-machine decentralised DNS caching - nscd/lwresd/etc

Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our ...
0
votes
1answer
1k views

Optimum size for ISA server disk cache

Our ISA server administrator is saying this: How the ISA cache works is as follows: when the ISA server receives a request to access a website, the first step it takes is check through the ...
27
votes
5answers
19k views

Which PHP (opcode) cache one should use and why?

I keep hearing about some PHP (opcode) caches like - APC, XCache, Memcache, eAccelerator, etc. But I couldn't ever figure out how to go about choosing one. Apart from performance benefit, which a ...
5
votes
3answers
7k views

Configuring Varnish to rewrite Expires/Cache-Control headers for client-side caching

How do I configure Varnish so that all responses to requests matching say "*.css" gets cached in the client's browser for 30 days? What I'm trying to achieve is making Varnish set the correct ...
5
votes
6answers
2k views

For a small home network, is there any point to running Squid? [closed]

For a small home network -- two laptops, two desktops, plus the main server -- should I expect much gain by running Squid on the main server? I fully understand the value of running a caching name ...