samba profiling and pcp pmda
alisonw at sgi.com
Thu Apr 12 08:15:27 GMT 2007
James Peach wrote:
> I mean to use one mmap per record type. The current scheme is ugly
> because it really doesn't want to be a proper allocator but it has to
> deal with 2 different sizes of records in the mmap. If you have a
> separate mmap for each record type, the allocator goes back to being
> nice and simple.
Surely the only benefit of splitting out record types per-file (i.e.
client and share) is that you can step through the allocated records as
an array rather than a linked list? Is there really much performance
gain there? I imagine the code to step through the list and add/remove
records will stay pretty much the same.
>> That's in the pipeline :) What i'm planning is to just add a bit of
>> extra magic to the existing Samba profiling macros that allow us to
>> split it out per-client and per-share along with the existing recording
>> of global counts and times. I'm pretty sure this is going to be fairly
>> elegant and small if i get it right.
> That sounds neat. It would be great if you had some code to reconcile
> the existing profiling stats with these metrics.
That's pretty much the plan. Each class of extended stats when summed
together should equal the existing profiling stats (in theory).
>> I have a separate patch which i can't submit yet (it's copyright SGI)
>> that splits out all of the current profiling statistics into smaller
>> groups that we can turn on and off independently.
> Do you mean the stats that currently live in the sysv shared memory
> IIRC you only get a big performance hit when you are timing operations.
> You can probably avoid this (to some degree) by using platform-specific
I'll look into it, thanks :) Right now there's just the regular
> IMHO, the Samba PMDA belongs in the PCP tree, not in the Samba tree.
> Since you are going to be the one maintaining it, it's easier all round
> if it lives there. We can simply remove the existing PMDA from the Samba
Sure that makes sense. So, with that in mind, what's the best way to
export a Samba header file for consumer apps? For instance, in the case
of the smbprofile.h header, it uses stuff like enum flush_reason_enum
and typedef BOOL which are defined elsewhere that third-party apps can't
see. Is the correct approach to write a script that munges the header
into something that could potentially stand alone in a "devel" package?
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