Hi,
I was playing around with zcache and fiddling with different
compression algorithms. Furthermore, I was integrating some checksum
algorithms for cleancache for my own project goals. Unfortunately, I
need to run a workload to trigger zcache.
Is there a way I can trigger zcache_get/put (specifically clean cache)
with a simple unit test (as opposed to running a workload) ? This will
greatly reduce my test/build time.
I was wondering if there is an existing unit test-suite. Or I could
write a simple kernel module to trigger put/get but I was wondering
how to go about invoking these operations. My guess is calling
cleancache_get/free using a page off (get_free_page) will not invoke
zcache.
Any suggestions will be useful.
Thanks,
Asim
Hi...
On Mon, Aug 13, 2012 at 3:58 AM, Asim [off-list ref] wrote:
Is there a way I can trigger zcache_get/put (specifically clean cache)
with a simple unit test (as opposed to running a workload) ? This will
greatly reduce my test/build time.
I am a new user of zcache (due to playing with recent Mint release).
I got impression that by reducing mapped memory you have (using "mem="
kernel parameter) and putting zram/zcache into high priority swap, is
enough to quickly trigger allocation into zcache. of course, you need
memory hogger for that, something like "tail -f /dev/zero".
CMIIW if misunderstood you...
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
Thanks Mulyadi for your response.
zcache has cleancache (a third level page cache) and front swap(swap
cache). I am trying to trigger clean cache and now the swap device.
But my guess is reducing the memory should also cause these evictions
rapidly.
Thanks,
Asim
On Sun, Aug 12, 2012 at 11:56 PM, Mulyadi Santosa
[off-list ref] wrote:
Hi...
On Mon, Aug 13, 2012 at 3:58 AM, Asim [off-list ref] wrote:
quoted
Is there a way I can trigger zcache_get/put (specifically clean cache)
with a simple unit test (as opposed to running a workload) ? This will
greatly reduce my test/build time.
I am a new user of zcache (due to playing with recent Mint release).
I got impression that by reducing mapped memory you have (using "mem="
kernel parameter) and putting zram/zcache into high priority swap, is
enough to quickly trigger allocation into zcache. of course, you need
memory hogger for that, something like "tail -f /dev/zero".
CMIIW if misunderstood you...
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
On Tue, Aug 14, 2012 at 1:53 AM, Asim [off-list ref] wrote:
Thanks Mulyadi for your response.
zcache has cleancache (a third level page cache) and front swap(swap
cache). I am trying to trigger clean cache and now the swap device.
But my guess is reducing the memory should also cause these evictions
rapidly.
Awaiting news from you about this experiment :)
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
Thanks Mulyadi - I was able to trigger clean cache by reducing the
memory and using dd to create a file larger than RAM.
-Asim
On Mon, Aug 13, 2012 at 10:42 PM, Mulyadi Santosa
[off-list ref] wrote:
On Tue, Aug 14, 2012 at 1:53 AM, Asim [off-list ref] wrote:
quoted
Thanks Mulyadi for your response.
zcache has cleancache (a third level page cache) and front swap(swap
cache). I am trying to trigger clean cache and now the swap device.
But my guess is reducing the memory should also cause these evictions
rapidly.
Awaiting news from you about this experiment :)
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
Hi Asim :)
On Thu, Aug 16, 2012 at 2:40 AM, Asim [off-list ref] wrote:
Thanks Mulyadi - I was able to trigger clean cache by reducing the
memory and using dd to create a file larger than RAM.
Good to hear your success, man! :)
I learn something from you too. Looking forward to hear about your
experiment's result in near future....
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com