Greg Ames wrote:
one of the things that inhibits our SMP scalability with
out-of-the-box Linux kernels is contention on the dcache spinlock.
oopss/dcache/dentry_cache/
The LTC guys use a dcache RCU (read-copy-update) patch
same here
Greg
I had a couple of inputs here : I was talking to our specweb person,
and he
had the following views :
1. most modern day os'es cache the files, and not do a disk io for
every
single file request. (duh !!.)
Part of the design of specweb was to make it difficult (but not
imposible) to cache
MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1) wrote:
I had a couple of inputs here : I was talking to our specweb person, and he
had the following views :
1. most modern day os'es cache the files, and not do a disk io for every
single file request. (duh !!.)
yep. Yesterday I powered up wimp for the
1. most modern day os'es cache the files, and not do a disk io for
every
single file request. (duh !!.)
yep. Yesterday I powered up wimp for the first time in ages and did
a
mini-SPECweb experimental run in preparation for fiddling with the
stat() in
mod_specweb99. I got really
David Hill wrote:
When our specweb guys were whacking Zeus they would first run a
program that would walk the file set to try and fill up the cache.
hey, I like that idea! I wonder if:
find /spec_docroot/file_set/ -type f | xargs cat /dev/null
...will do the job? I'll give it a try.
Greg
When our specweb guys were whacking Zeus they would first run a
program that would walk the file set to try and fill up the cache.
Zues had some sort of internal cache that needed to be warmed on a
per-process basis (they would run with one process per cpu), as well
as warming the read cache
Greg Ames wrote:
Bill Stoddard wrote:
Why not use mod_file_cache?
On my wimpy 200MHz server, the SPEC file_set contains 5760 files and
uses .8G of disk. On more modern servers, the size of the file_set goes
up in proportion to the number of conforming connections you hope to
push thru it,
-Original Message-
From: Greg Ames [mailto:[EMAIL PROTECTED]
Sent: Tuesday, January 28, 2003 11:05 AM
To: [EMAIL PROTECTED]
Subject: Re: gettimeofday calls
Greg Ames wrote:
Bill Stoddard wrote:
Why not use mod_file_cache?
On my wimpy 200MHz server, the SPEC file_set contains 5760
MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1) wrote:
I don't know if this has been discussed already, but I was thinking of the
following alternatives :
1. how about the listener thread in each of the child process keeps updating
a global time variable that each of the threads can refer to ?.
2. set
Is this against the spec or something ?.
Which spec? If you are referring to either the SPECWeb99 run rules or to
RFC2616, neither of them dictate which syscalls you use.
IIRC, the SPECWeb99 run rules just say that you have to treat ad expiration
correctly.
S.
--
Covalent Technologies
MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1) wrote:
I tried that, and I got back error from specweb99 stating that the responses
were not conforming. (or something like that)..
OK, if you used r-request_time to replace the time() calls in mod_specweb99,
you might have convert the units if the result
Infact, I tried this out yesterday (having the one global_time variable), it
gives me around 3-4% improvement. But, occasionally I do get some
un-conforming results, and I'm trying to figure out if it's because of the
time stamp.
You probably need to mutex updates to your global variable, which
-Original Message-
From: Bill Stoddard [mailto:[EMAIL PROTECTED]
[snip]
You probably need to mutex updates to your global variable, which will
probably suck out most of your performance gains.
That is correct.. The assumption I had is : timestamp is done once per
request, and since there
MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1) wrote:
I was referring to the time(), and thinking of
alternative ways of replacing the time() call.
I did that (without using the macros) - but didn't see much difference
though.. I think I was banging my head against the wall yesterday - by tring
to
Bill Stoddard wrote:
1. Why we need to do the apr_stat() for static files each time the
request
comes in - can it be done during the module_init() phase, and the
values put
in a array of some sort. ?.
Files change. Why not use mod_file_cache? It will (or should if it does
not have a bug)
MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1) wrote:
The following is the tusc output of httpd (2.0.43) + mod_specweb99.c
on HP-UX.. Almost every single request has a gettimeofday system call - is
there any way to avoid it ?.
The GET /file_set/* requests are just plain ol' static files served by the
Ames [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 23, 2003 11:19 AM
To: [EMAIL PROTECTED]
Subject: Re: gettimeofday calls
MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1) wrote:
The following is the tusc output of httpd (2.0.43) +
mod_specweb99.c
on HP-UX.. Almost every single request has
() - in the ap_log_error(), I've
put it in ifdef DEBUG :-).. Trying this out now..
-Madhu
-Original Message-
From: David Hill [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 23, 2003 1:56 PM
To: [EMAIL PROTECTED]
Subject: Re: gettimeofday calls
I would think that using the http request
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