Re: [Simpleweb-Support] Speed in serving requests
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Re: [Simpleweb-Support] Speed in serving requests
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From: Niall G. <gal...@ya...> - 2007-03-11 13:54:49
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Hi Oscar,=0A=0A=0A=0ATypically I can complete approx 3000 requests per seco=
nd on a 2GHz=0Apentium centrino on linux with about 1000 concurrent clients=
serving an 8k image. It is impossible for me to give you an exact configur=
ation as I do not know how you are measuring response times, what client yo=
u are using, or how you are serving your files. I would experiment with the=
following:=0A=0A1) Remember simple is not a servlet container, at its core=
it enables asynchronous processing, which makes it very different from a s=
ervlet container. This adds an extra requirement, you must always always ex=
plicitly close the output stream like so.=0A=0AOutputStream out =3D resp.ge=
tOutputStream();=0A// your code here=0Aout.close(); // always close when fi=
nished=0A=0A2) Test with each response having a "Connection: close" set in =
the header, like so=0A=0Aresponse.set("Connection: close")=0A=0AIf this imp=
roves performance, then you know client requests are intermittent.=0A=0A3) =
Ensure that your maximum idle time for a connection is low, this means you =
need to create a PipelineHandler from the PipelineHandlerFactory=0A=0AProto=
colHandler proto =3D new MyProtocolHandler();=0APipelineHandler handler =3D=
PipelineHandlerFactory.getInstance(proto, 10, 100)=0A=0AThis ensures that =
at most an open connection will be idle for 100ms. This feature will have m=
any improvements in the next release.=0A=0A4) Use buffering output, this en=
sures that interaction with TCP is good=0A=0APipelineFactory factory =3D ne=
w BufferedPipelineFactory(2086);=0AConnection connection =3D ConnectionFact=
ory.getConnection(handler, factory);=0A=0AExperimenting with these should p=
rovide you with some clues as to why you are getting poor performance. =0A=
Niall Gallagher=0A=0A----- Original Message ----=0AFrom: Oscar Perez <os_ca=
rp...@te...>=0ATo: Simple support and user issues <simpleweb-support@=
lists.sourceforge.net>=0ASent: Sunday, March 11, 2007 3:09:14 AM=0ASubject:=
Re: [Simpleweb-Support] Speed in serving requests=0A=0AHi,=0Aserver load w=
ill be about 10 to 15 clients (it's a closed system) =0Aissuing continuous =
requests (basically thumbnails pages) and I need to =0Ahave load times of l=
ess than 0.5 seconds. By the moment I'm testing with =0Aonly one client and=
the response time is of about 2-3 seconds, so it's =0Atoo slow.=0AI'm serv=
ing files by reading them (with a 4kb buffer) and writing to =0Aresponse's =
OutputStream directly. But I'm caching files in memory, so =0Afiles are onl=
y read the first time they are requested. I'll try =0AFileEngine and test i=
f it improves performance.=0A=0AThank you very much.=0A=0A=D2scar P=E9rez=
=0A=0A=0AEn/na Jeff Nichols ha escrit:=0A> Hi Oscar,=0A>=0A> Where is your =
performance issue? Raw speed when handling a single =0A> request, or only=
under load?=0A>=0A> Also, how are you serving those files? Are you readin=
g and writing =0A> them manually, or are you using the built-in FileEngine=
?=0A>=0A> Jeff=0A>=0A>=0A> On Mar 10, 2007, at 1:18 PM, Oscar Perez wrote:=
=0A>=0A> =0A>> Hi,=0A>> first of all, I would like to congratulate Simple=
web's creators for=0A>> their work. Now it's really easy to embbed a web se=
rver into an =0A>> existing=0A>> Java application.=0A>> But I've got a que=
stion: is there a way to tune performance. I mean,=0A>> I've implemented a =
server with just one service. This service simply=0A>> reads files from the=
filesystem and returns them to the client. But =0A>> I'm=0A>> unable to a=
chieve the required performance and I wonder if I can =0A>> tune it=0A>> t=
o be faster.=0A>>=0A>> Thanks a lot for your help and congratulations again=
!=0A>>=0A>> Oscar P=E9rez.=0A>>=0A>> --------------------------------------=
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