Re: [Chicken-users] Need help to figure out where this strange performance impact is coming from

[Jörg F . Wittenberger]

Tried that too:  on AMD64 (Debian) chicken 4.10.1 from tarball does NOT
give any difference.

But even if it may be an ARM related problem: how is it even possible??!

Am 14.01.2016 um 11:10 schrieb Jörg F. Wittenberger:
> 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 call-cc.org.  (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
> declarations).
> 
>> Also -O5 does not make any difference.
> 
> Same here.  Same strange slowdown.
> 
> Anybody else having another platform to try on?  An ARM-related problem?
> 
>