Robert Watson wrote:
be a good time to try to revalidate that. Basically, the goal would be
to make the pcpu cache FIFO as much as possible as that maximizes the
you mean FILO or LIFO right?
chances that the newly allocated object already has lines in the cache.
It's a fairly trivial twea
On Sat, Feb 02, 2008 at 11:31:31AM +0200, Alexander Motin wrote:
>To check UMA dependency I have made a trivial one-element cache which in my
>test case allows to avoid two for four allocations per packet.
You should be able to implement this lockless using atomic(9). I haven't
verified it, but
Robert Watson wrote:
Basically, the goal would be
to make the pcpu cache FIFO as much as possible as that maximizes the
chances that the newly allocated object already has lines in the cache.
Why FIFO? I think LIFO (stack) should be better for this goal as the
last freed object has more cha
Am Sa, 2.02.2008, 23:05, schrieb Alexander Motin:
> Robert Watson wrote:
>> Hence my request for drilling down a bit on profiling -- the question
>> I'm asking is whether profiling shows things running or taking time that
>> shouldn't be.
>
> I have not yet understood why does it happend, but hwpm
On Sun, 3 Feb 2008, Alexander Motin wrote:
Robert Watson wrote:
Basically, the goal would be to make the pcpu cache FIFO as much as
possible as that maximizes the chances that the newly allocated object
already has lines in the cache.
Why FIFO? I think LIFO (stack) should be better for this
On Sat, 2 Feb 2008, Kris Kennaway wrote:
Alexander Motin wrote:
Robert Watson wrote:
Hence my request for drilling down a bit on profiling -- the question I'm
asking is whether profiling shows things running or taking time that
shouldn't be.
I have not yet understood why does it happend, bu
Alexander Motin wrote:
Robert Watson wrote:
Hence my request for drilling down a bit on profiling -- the question
I'm asking is whether profiling shows things running or taking time
that shouldn't be.
I have not yet understood why does it happend, but hwpmc shows huge
amount of "p4-resource-
Robert Watson wrote:
Hence my request for drilling down a bit on profiling -- the question
I'm asking is whether profiling shows things running or taking time that
shouldn't be.
I have not yet understood why does it happend, but hwpmc shows huge
amount of "p4-resource-stall"s in UMA functions
On Sat, Feb 02, 2008 at 09:56:42PM +0200, Alexander Motin wrote:
>Peter Jeremy ?:
>> On Sat, Feb 02, 2008 at 11:31:31AM +0200, Alexander Motin wrote:
>>> To check UMA dependency I have made a trivial one-element cache which in
>>> my test case allows to avoid two for four allocations per packe
Peter Jeremy пишет:
On Sat, Feb 02, 2008 at 11:31:31AM +0200, Alexander Motin wrote:
To check UMA dependency I have made a trivial one-element cache which in my
test case allows to avoid two for four allocations per packet.
You should be able to implement this lockless using atomic(9). I have
> Thanks, I have already found this. There was only problem, that by
> default it counts cycles only when both logical cores are active while
> one of my cores was halted.
Did you try the 'active' event modifier: "p4-global-power-events,active=any"?
> Sampling on this, profiler shown results clos
> I have tried it for measuring number of instructions. But I am in doubt
> that instructions is a correct counter for performance measurement as
> different instructions may have very different execution times depending
> on many reasons, like cache misses and current memory traffic. I have
> trie
Joseph Koshy wrote:
You cannot sample with the TSC since the TSC does not interrupt the CPU.
For CPU cycles you would probably want to use "p4-global-power-events";
see pmc(3).
Thanks, I have already found this. There was only problem, that by
default it counts cycles only when both logical co
Robert Watson wrote:
I guess the question is: where are the cycles going? Are we suffering
excessive cache misses in managing the slabs? Are you effectively
"cycling through" objects rather than using a smaller set that fits
better in the cache?
In my test setup only several objects from zo
On Sat, 2 Feb 2008, Alexander Motin wrote:
Robert Watson wrote:
I guess the question is: where are the cycles going? Are we suffering
excessive cache misses in managing the slabs? Are you effectively "cycling
through" objects rather than using a smaller set that fits better in the
cache?
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