[ic] Upgrade to Interchange-5.7.4 performance issues

[Bill Carr]

On Mar 17, 2010, at 7:43 AM, Stefan Hornburg (Racke) wrote:

> Bill Carr wrote:
>> On Mar 17, 2010, at 7:06 AM, Bill Carr wrote:
>>> On Mar 16, 2010, at 11:14 PM, Peter wrote:
>>> 
>>>> On 17/03/10 13:34, Bill Carr wrote:
>>>>> I tried removing all UTF-8 flags and directives and I've tried with
>>>>> 5.7.5 nightly and I still get big slow downs compared to running
>>>>> 5.4.0. During the slow downs there are several interchange processes
>>>>> consuming 100% CPU. What else can I try?
>>>> Have you tried setting the MINIVEND_DISABLE_UTF8 environment variable
>>>> before starting the Interchange server?
>>> Yes, I put the following right in bin/interchange
>>> 
>>> $ENV{MINIVEND_DISABLE_UTF8} = 1;
>> I ran strace on both 5.4.0 and 5.7.5 and one obvious difference I see in 5.7.5 is the following:
>> open("/dev/urandom", O_RDONLY)          = 18
>> read(18, "\322\201\304#", 4)            = 4
>> close(18)                               = 0
>> select(8, [2], NULL, NULL, {1, 0})      = 1 (in [2], left {0, 999998})
>> read(2, "a", 1)                         = 1
>> select(8, [2], NULL, NULL, {1, 0})      = 1 (in [2], left {0, 999999})
>> read(2, "r", 1)                         = 1
>> select(8, [2], NULL, NULL, {1, 0})      = 1 (in [2], left {0, 999999})
>> read(2, "g", 1)                         = 1
>> select(8, [2], NULL, NULL, {1, 0})      = 1 (in [2], left {0, 999999})
>> read(2, " ", 1)                         = 1
>> select(8, [2], NULL, NULL, {1, 0})      = 1 (in [2], left {0, 999999})
>> read(2, "0", 1)                         = 1
>> Followed by hundreds of the last two lines above (with different values). Is that a clue? Is that expected?
> 
> It somehow reads some data through a socket one by one character, that's for certain not efficient.
> Can you pastebin a complete strace so we can see which socket is attached to filehandle #8?
I put here http://www.bottlenose-wine.com/userfiles/strace.txt
It was too big for pastebin. Wasn't sure what the relevant parts were in order to pare it down.

 
Bill Carr 
Bottlenose - Wine & Spirits eBusiness Specialists 
(413) 584-0400 
http://www.bottlenose-wine.com