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21 messages in org.apache.httpd.devRe: Is async the answer| From | Sent On | Attachments |
|---|---|---|
| Akins, Brian | Jan 18, 2008 10:51 am | |
| Justin Erenkrantz | Jan 18, 2008 11:16 am | |
| Colm MacCarthaigh | Jan 18, 2008 11:20 am | |
| Akins, Brian | Jan 18, 2008 11:26 am | |
| Akins, Brian | Jan 18, 2008 11:30 am | |
| Colm MacCarthaigh | Jan 18, 2008 12:07 pm | |
| Akins, Brian | Jan 18, 2008 1:16 pm | |
| Colm MacCarthaigh | Jan 18, 2008 1:28 pm | |
| Ruediger Pluem | Jan 18, 2008 2:30 pm | |
| Justin Erenkrantz | Jan 18, 2008 4:33 pm | |
| Niklas Edmundsson | Jan 19, 2008 3:53 am | |
| Graham Leggett | Jan 19, 2008 4:45 am | |
| Davi Arnaut | Jan 19, 2008 6:57 am | |
| Jim Jagielski | Jan 19, 2008 7:04 am | |
| Graham Leggett | Jan 19, 2008 8:01 am | |
| Henrik Nordström | Jan 19, 2008 1:14 pm | |
| Henrik Nordström | Jan 19, 2008 1:19 pm | |
| Davi Arnaut | Jan 19, 2008 3:29 pm | |
| Graham Leggett | Jan 20, 2008 7:44 am | |
| Akins, Brian | Jan 22, 2008 10:03 am | |
| Akins, Brian | Jan 22, 2008 10:07 am |
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| Subject: | Re: Is async the answer | Actions... |
|---|---|---|
| From: | Akins, Brian (Bria...@turner.com) | |
| Date: | Jan 18, 2008 10:51:39 am | |
| List: | org.apache.httpd.dev | |
On 1/18/08 12:18 PM, "Colm MacCarthaigh" <co...@allcosts.net> wrote:
Hmmm, it depends what you mean by scale really. Async doesn't help a daemon scale in terms of concurrency or throughput, if anything it might even impede it, but it certainly can help improve latency and responsivity greatly. On the whole, it's easy to see how it might make the end user experience of a very busy server much more pleasant.
I also wonder is that has actually been tested or if it's just a "factoid"?
Response time never increased in any measurable amount.
I suspect it might though if the scheduler became bound, async would route the interupts more efficiently.
But, I wonder if the scheduler would become bound in a "reasonable" amount of traffic.
discussions on scalability baffling, the reality is that modern hardware can outscale pretty much any amount of bandwidth you can buy regardless of the software.
Bandwidth generally isn't an issue for us anymore (thanks to gzip). We can still overrun the CPU with small objects requests/responses. On "large" objects (ie, over 16k or so), the CPU is bored when multiple gig interfaces are full.
The scalability wars should really be over, everyone won - kernel's rule :-)
Which is why I hate to see a ton of work go into async core if it actually does very little to help performance (or if it hurts it) and makes writing modules harder. It braindead simple nowadays to write well behaved high performance modules (well, mostly) bcs you rarely worry about threads, reads/writes, etc. Full async programming is just as challenging as handling a ton of threads yourself.
My $.02 US worth (which ain't much).
-- Brian Akins Chief Operations Engineer Turner Digital Media Technologies
-- Brian Akins Chief Operations Engineer Turner Digital Media Technologies