* Re: Use of sub-buffers - more subbuffers but smaller, or less but bigger?
[not found] <OF47254F23.1A4EBFF6-ONC2257BB9.003393B9-C2257BB9.0033D3A6@il.ibm.com>
@ 2013-08-07 1:13 ` Mathieu Desnoyers
0 siblings, 0 replies; 2+ messages in thread
From: Mathieu Desnoyers @ 2013-08-07 1:13 UTC (permalink / raw)
To: Amit Margalit; +Cc: lttng-dev
* Amit Margalit (AMITM@il.ibm.com) wrote:
> Hello,
>
> I'm trying to understand the trade-offs involved in choosing sub-buffer
> number and size.
>
> So the question is what are the benefits and the disadvantages of
> choosing, say, 32 subbuffers of 1MB versus 8 subbuffers of 4MB, or maybe 4
> subbuffers of 8MB?
Boundaries of subbuffers are synchronization points, so you add slightly
more overhead with smaller sub-buffers. This is an argument for having
few large sub-buffers.
Also, with periodical timer flush (useful for upcoming streaming
feature), you might want more than two sub-buffers per buffer, because
otherwise, you might run into situations where the buffer appears to be
full (and therefore events are discarded) just because the timer flush
flushes a sub-buffer before it is filled. This is an argument for not
making the number of sub-buffers _too_ small if you use switch timer.
Hoping this helps,
Mathieu
>
> Thanks,
>
> Amit Margalit
> IBM XIV - Storage Reinvented
> XIV-NAS Development Team
> Tel. 03-689-7774
> Fax. 03-689-7230
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Use of sub-buffers - more subbuffers but smaller, or less but bigger?
@ 2013-07-31 9:26 Amit Margalit
0 siblings, 0 replies; 2+ messages in thread
From: Amit Margalit @ 2013-07-31 9:26 UTC (permalink / raw)
To: lttng-dev
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Hello,
I'm trying to understand the trade-offs involved in choosing sub-buffer
number and size.
So the question is what are the benefits and the disadvantages of
choosing, say, 32 subbuffers of 1MB versus 8 subbuffers of 4MB, or maybe 4
subbuffers of 8MB?
Thanks,
Amit Margalit
IBM XIV - Storage Reinvented
XIV-NAS Development Team
Tel. 03-689-7774
Fax. 03-689-7230
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[not found] <OF47254F23.1A4EBFF6-ONC2257BB9.003393B9-C2257BB9.0033D3A6@il.ibm.com>
2013-08-07 1:13 ` Use of sub-buffers - more subbuffers but smaller, or less but bigger? Mathieu Desnoyers
2013-07-31 9:26 Amit Margalit
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