[ic] Upgrade to Interchange-5.7.4 performance issues

[Bill Carr]

On Mar 17, 2010, at 10:26 AM, Stefan Hornburg (Racke) wrote:

> Bill Carr wrote:
>> On Mar 17, 2010, at 9:53 AM, Stefan Hornburg (Racke) wrote:
>>> Bill Carr wrote:
>>>> 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.
>>> What's your exact Interchange/Apache setup? Do you use by chance mod_interchange?
>> Just like it says below:
>> Apache/1.3.34 (Debian) mod_gzip/1.3.26.1a mod_ssl/2.8.25 OpenSSL/0.9.8c mod_interchange/1.33
>> I've never traced it but I also get poor performance running Apache2 with Interchange::Link
> 
> So it looks like your problem is related to mod_interchange / Interchange::Link.
I guess so. I do use the same link programs when I change from 5.4.0 to 5.7.5. What is the best method for linking?
 
Bill Carr 
Bottlenose - Wine & Spirits eBusiness Specialists 
(413) 584-0400 
http://www.bottlenose-wine.com