rsharma51 at sapient
Jul 19, 2012, 9:15 PM
Post #3 of 3
RE: mod_perl Filters: Selecting the most appropriate buffer size
[In reply to]
Many thanks for the inputs. This definitely helps. Will be testing out the performance with different buffer size 1K and higher.
From: Scott Gifford [mailto:sgifford [at] suspectclass]
Sent: Thursday, July 19, 2012 8:13 PM
To: Rommel Sharma
Cc: mod_perl list
Subject: Re: mod_perl Filters: Selecting the most appropriate buffer size
On Tue, Jul 10, 2012 at 7:16 AM, Rommel Sharma <rsharma51 [at] sapient<mailto:rsharma51 [at] sapient>> wrote:
I am going through the documentation on mod_perl filters at the link below:
Examples set a buffer size to process the content held in the buffer like:
use constant BUFF_LEN => 1024;
What is the best approach to reach most optimum buffer size? Is there a best practices like guideline here?
Not sure about mod_perl specifics, but the tradeoff with buffer sizes is generally that larger buffers give better overall throughput, at the cost of more memory and latency. On a disk, using a number that is a multiple of the filesystem block size will usually give the best performance. With data coming from the network or a script, I don't think it will matter much. You can certainly try different values and measure the results, but anything 1K or more will probably be OK.
Hope this helps,