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Re: [Chicken-users] Need help to figure out where this strange performan

From: Jörg F . Wittenberger
Subject: Re: [Chicken-users] Need help to figure out where this strange performance impact is coming from
Date: Thu, 14 Jan 2016 11:10:36 +0100
User-agent: Mozilla/5.0 (X11; Linux armv7l; rv:38.0) Gecko/20100101 Icedove/38.4.0

Am 13.01.2016 um 21:46 schrieb Christian Kellermann:
> * Christian Kellermann <address@hidden> [160113 21:44]:
>> * Jörg F. Wittenberger <address@hidden> [160113 12:38]:
>>> yesterday I found that simply having a (use mailbox) in some code had a
>>> huge impact (more than a factor of 3) at the performance of the
>>> resulting executable.  Without using the mailbox stuff at all.
>>> Meanwhile I figured out that this has nothing at all to do with the
>>> mailbox egg.  But _all_ with the use of srfi-1.
>> Hm which OS and architecture are you running this on? On my OpenBSD
>> amd64 system the two versions do fluctuate but are indistinguishable
>> when run a couple hundred times.

Really?!  Commenting out this (use srfi-1) does not make a difference
there?  Strange!

I just double-checked with chicken rev 022dce82 (master built
yesterday).  (Before I used rev 274e7afa.)

Additionally I tried now chicken 4.10.1 built from the tarball
distributed from  (I moved the installed version out of the
way for this test.)

All the same result: slowdown of roughly 4x (160:40).

OS: Debian stretch, ARMv7 Processor rev 10

Another try: Raspberry Pi, Raspberian.  Similar results, about 60:20

>> I have used CHICKEN Version 4.10.1 (rev f36c19c) and compiled with
>> default options.

Used default option this time.  (But see source - contains some

> Also -O5 does not make any difference.

Same here.  Same strange slowdown.

Anybody else having another platform to try on?  An ARM-related problem?

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