On 16 January 2014 16:54, Boxer, Aaron <aaron.bo...@uhn.ca> wrote: > On 16 January 2014 16:35, Boxer, Aaron <aaron.bo...@uhn.ca> wrote: >> Thanks, Oleg. I am not trying to criticize the project in any way; >> just wondering if anyone has insight into why, on Windows, Java NIO is so >> much slower than stream IO. > > If it is only slower for DVD copies, that seems more like an issue with DVD > caching. > > Are you sure that the synch and asynch tests both started from exactly the > same environment? > > What do you mean by environment? Both tests read the same DVD, after > flushing the Windows OS file cache.
I meant the phsyical environment. There are other potential hardware caches. For example the DVD drive. > But, the clients are, of course, set up differently. Would you like me to > post how I am configuring the clients? > What about the DVD cache? Did you reset the drive? Did you repeat the tests multiple times? Sometimes with async first, other times with sync first? > > > >> Perhaps it has to do with buffer size, thread count, ..... ? >> >> -----Original Message----- >> From: Oleg Kalnichevski [mailto:ol...@apache.org] >> Sent: Thursday, January 16, 2014 11:15 AM >> To: HttpClient User Discussion >> Subject: Re: ZeroCopyPut mystery >> >> On Thu, 2014-01-16 at 04:33 +0000, Boxer, Aaron wrote: >>> Hello, >>> >>> When I use ZeroCopyPut with hard drive (spinning disk ) disk files, I get a >>> network transfer rate of about 250 MBPS for first time read of files; 850 >>> MBPS if the files are already in the Windows OS file cache. Synchronous put >>> gives me about 30 MBPS. >>> >>> But, when I am dealing with files on DVD, I get a network transfer rate of >>> 5 MBPS for first time read of files, and 850 MBPS if files are in the OS >>> file cache. >>> Synchronous put gives me about 30 MBPS. >>> >>> So, in the case of first read of DVD files, synchronous client is superior. >>> Synchronous should be faster, because it can read and send at the same >>> time. >>> >>> Does this make sense? It seems a little strange to me. >>> >> >> Aaron, >> >> Zero copy data transfer is very platform specific. Java merely provides a >> common APIs, which however can have radically different implementations on >> different platforms and therefore can have different performance >> characteristics. >> >> I guess these numbers have more to do with Windows than with HttpAsyncClient. >> >> Oleg >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org >> For additional commands, e-mail: httpclient-users-h...@hc.apache.org >> >> >> This e-mail may contain confidential and/or privileged information for the >> sole use of the intended recipient. >> Any review or distribution by anyone other than the person for whom it was >> originally intended is strictly prohibited. >> If you have received this e-mail in error, please contact the sender and >> delete all copies. >> Opinions, conclusions or other information contained in this e-mail may not >> be that of the organization. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org > For additional commands, e-mail: httpclient-users-h...@hc.apache.org > > > This e-mail may contain confidential and/or privileged information for the > sole use of the intended recipient. > Any review or distribution by anyone other than the person for whom it was > originally intended is strictly prohibited. > If you have received this e-mail in error, please contact the sender and > delete all copies. > Opinions, conclusions or other information contained in this e-mail may not > be that of the organization. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org > For additional commands, e-mail: httpclient-users-h...@hc.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org For additional commands, e-mail: httpclient-users-h...@hc.apache.org
