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Hang on single threaded loop
by jojy.varghese
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Hi all
I am using the fuse low level API and while testing the file system we implemented using fuse, we found out that fuse hangs if we hit too many reads in a short interval (say 15 reads in 10 secs). HAs anyone else encountered it? After some debugging, I see that the "read" in "fuse_kern_chan_receive" is what is stuck. Any help is much appreciated. thx ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel |
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Re: Hang on single threaded loop
by Arun Ramachandran
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I do not think it has anything to do with the frequency of reads. What is
probably happening is that you are not sending a proper response to one of the calls- perhaps check close and flush if you have implemented them. The kernel is probably waiting for response. If the number is after 10 calls that is what it is ... -arun -----Original Message----- From: jojy.varghese@... [mailto:jojy.varghese@...] Sent: Tuesday, October 20, 2009 4:38 PM To: fuse-devel@... Subject: [fuse-devel] Hang on single threaded loop Hi all I am using the fuse low level API and while testing the file system we implemented using fuse, we found out that fuse hangs if we hit too many reads in a short interval (say 15 reads in 10 secs). HAs anyone else encountered it? After some debugging, I see that the "read" in "fuse_kern_chan_receive" is what is stuck. Any help is much appreciated. thx ---------------------------------------------------------------------------- -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel |
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Re: Hang on single threaded loop
by Goswin von Brederlow-2
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"Arun Ramachandran" <arunramachandran@...> writes:
> I do not think it has anything to do with the frequency of reads. What is > probably happening is that you are not sending a proper response to one of > the calls- perhaps check close and flush if you have implemented them. The > kernel is probably waiting for response. If the number is after 10 calls > that is what it is ... > > -arun And I can say that it doesn't hang even after tousands of read, write, open or close calls. You just have to answere them all as there is a limited number of requests the kernel will do in parallel. MfG Goswin ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel |
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Re: Hang on single threaded loop
by jojy.varghese
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I was able to figure out the actual issue. It was because i was
calling "fuse_reply_err" from release only when there was an error. I didnt know that the same call has to be made even if there is no error. Maybe the API should be renamed to avoid confusion or add another call called "fuse_reply_ok" for success case. thanks On Oct 22, 2009 8:09am, Goswin von Brederlow <goswin-vb@...> wrote: > "Arun Ramachandran" arunramachandran@...> writes: > > I do not think it has anything to do with the frequency of reads. What > is > > probably happening is that you are not sending a proper response to one > of > > the calls- perhaps check close and flush if you have implemented them. > The > > kernel is probably waiting for response. If the number is after 10 calls > > that is what it is ... > > > > -arun > And I can say that it doesn't hang even after tousands of read, write, > open or close calls. You just have to answere them all as there is a > limited number of requests the kernel will do in parallel. > MfG > Goswin ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel |
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Re: Hang on single threaded loop
by Goswin von Brederlow-2
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jojy.varghese@... writes:
> I was able to figure out the actual issue. It was because i was calling > "fuse_reply_err" from release only when there was an error. I didnt know that > the same call has to be made even if there is no error. Maybe the API should be > renamed to avoid confusion or add another call called "fuse_reply_ok" for > success case. >> >>thanks In the fuse_lowlevel.h for each callback it states what replies are valid: e.g. * Release an open file * Valid replies: * fuse_reply_err void (*release) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi); and if no reply is required it will also say so: * Initialize filesystem * There's no reply to this function void (*init) (void *userdata, struct fuse_conn_info *conn); You have to follow those rules. I'm wondering though why fuse_reply_none is not a valid reply for e.g. release() signaling no error. Does fuse_reply_none() differ from fuse_reply_err(ESUCCESS)? MfG Goswin ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel |
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Re: Hang on single threaded loop
by Miklos Szeredi
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On Thu, 22 Oct 2009, Goswin von Brederlow wrote:
> I'm wondering though why fuse_reply_none is not a valid reply for > e.g. release() signaling no error. Does fuse_reply_none() differ from > fuse_reply_err(ESUCCESS)? Yes, fuse_reply_none() basically just frees the request structure, while fuse_reply_err() will always send a reply to the kernel. The release request is special in that it needs a reply, but actually ignores the return value from it. Thanks, Miklos ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ fuse-devel mailing list fuse-devel@... https://lists.sourceforge.net/lists/listinfo/fuse-devel |
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