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From: Jianzhou Zhao <jianzhou@seas.upenn.edu>
To: caml-list@yquem.inria.fr
Subject: Average cost of the OCaml GC
Date: Wed, 10 Nov 2010 22:59:55 -0500	[thread overview]
Message-ID: <AANLkTinaSS+QOCJ8AA9LMMM9OHZMKZ2NVQr9KY48XkK_@mail.gmail.com> (raw)

Hi,

What is the average cost of the OCaml GC? I have a program that calls
'mark_slice' in 57% of the total execution time, and calls
'sweep_slice' in 21% of the total time, reported by Callgrind, which
is a profiling tool in Valgrind. 57% and 21% are the 'self cost' ---
the cost of the function itself ('Self Cost'), rather than the cost
including all called functions ('Inclusive Cost'). I guess
'mark_slice'  and  'sweep_slice'  are functions from OCaml GC. Are
these numbers normal?

My program calls both OCaml and C, which passes around C data types in
between. I also doubt if I defined the interface in an 'unefficient'
way that slows down the GC. Are there any rules in mind to make GC
work more efficiently?

Thanks.
-- 
Jianzhou


             reply	other threads:[~2010-11-11  3:59 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-11  3:59 Jianzhou Zhao [this message]
2010-11-11  9:08 ` [Caml-list] " Goswin von Brederlow
2010-11-11 13:52   ` Jianzhou Zhao
2010-11-11 14:14     ` Michael Ekstrand
2010-11-11 20:11     ` Goswin von Brederlow
2010-11-12 17:27       ` Jianzhou Zhao
2010-11-12 21:54         ` ygrek
2010-11-16 10:02         ` Goswin von Brederlow

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