* using pgmeter for benchmarking
@ 2007-11-01 10:45 addy soft
2007-11-01 14:06 ` Avishay Traeger
0 siblings, 1 reply; 2+ messages in thread
From: addy soft @ 2007-11-01 10:45 UTC (permalink / raw
To: linux-fsdevel
hello all,
I am a newbie in filesystem field and wanted to benchmark filesystem
using pgmeter.
But the source that i have downloaded from
http://pgmeter.sourceforge.net/ CVS seems to be too old and have a
kernel patch with it which is for kernel 2.2.6.
There is a syscall implemented with that version of pgmeter which is
used to flush the page cache for a particular file.
Has anyone used pgmeter to work with kernel 2.6?
I want to use pgmeter for kernel 2.6.18.
Is there pgmeter for the present kernel or will i need to work to port
it to linux 2.6 ?
-addy
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: using pgmeter for benchmarking
2007-11-01 10:45 using pgmeter for benchmarking addy soft
@ 2007-11-01 14:06 ` Avishay Traeger
0 siblings, 0 replies; 2+ messages in thread
From: Avishay Traeger @ 2007-11-01 14:06 UTC (permalink / raw
To: addy soft; +Cc: linux-fsdevel
On Thu, 2007-11-01 at 16:15 +0530, addy soft wrote:
> hello all,
>
> I am a newbie in filesystem field and wanted to benchmark filesystem
> using pgmeter.
>
> But the source that i have downloaded from
> http://pgmeter.sourceforge.net/ CVS seems to be too old and have a
> kernel patch with it which is for kernel 2.2.6.
>
> There is a syscall implemented with that version of pgmeter which is
> used to flush the page cache for a particular file.
Since 2.6.16 there has been a drop_caches proc file. Instead of porting
this system call, I think you could modify pgmeter to use this. Here
are some details:
===============================================
Writing to this will cause the kernel to drop clean caches, dentries and
inodes from memory, causing that memory to become free.
To free pagecache:
* echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
* echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
* echo 3 > /proc/sys/vm/drop_caches
As this is a non-destructive operation and dirty objects are not
freeable, the user should run "sync" first!
===============================================
So instead of calling the system call, you should be able to call sync()
and then write either 1 or 3 to the proc file.
Hope that helps!
Avishay
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-11-01 10:45 using pgmeter for benchmarking addy soft
2007-11-01 14:06 ` Avishay Traeger
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