Re: [OMPI users] About debugging and asynchronous communication

Thanks for everyone who answered my question. I have fixed the problem. In my codes, for each communication, a process would first send the length of message and then the content of the message. To check whether previous communication succeed, I only checked whether the content have been sent. In

Re: [OMPI users] About debugging and asynchronous communication

Well, if it is the next message then I guess you have a bug, your counter is not consistent. I am pretty sure the error is on your side, I do something similar but have never experienced anything like that. :) 2014-09-19 3:21 GMT+02:00 XingFENG : > Thanks for your

Re: [OMPI users] About debugging and asynchronous communication

Thanks for your advice. I added tags for messages in ascending order. But it didn't work, either. For example, after 103043 times of communication, in the sender side, it sends an int 78 with tag 206086, followed by 78 bytes data with tag 206087. In the receiver side, it receives an int 41 with

Re: [OMPI users] About debugging and asynchronous communication

There is no guarantee that the messages will be received in the same order that they were sent. Use tags or another mechanism to match the messages on send and recv ends. On 09/18/2014 10:42 AM, XingFENG wrote: I have found some thing strange. Basically, in my codes, processes send and receive

Re: [OMPI users] About debugging and asynchronous communication

If all your send/recv are asynchronous you should ensure different tags to decipher between messages. It could be that you have the same tag for two different asynchronous sends, in which case there is a race condition for the receiving end. Also, if you know the upper bound of your messages I

Re: [OMPI users] About debugging and asynchronous communication

I have found some thing strange. Basically, in my codes, processes send and receive messages to/from others with variable lengths asynchronously. When sending messages, a process would first send the length of message and then the content of the message. When receiving, a process would first

Re: [OMPI users] About debugging and asynchronous communication

Thank you for your reply! I am still working on my codes. I would update the post when I fix bugs. On Thu, Sep 18, 2014 at 9:48 PM, Nick Papior Andersen wrote: > I just checked, if the tests return "Received" for all messages it will > not go into memory burst. > Hence

Re: [OMPI users] About debugging and asynchronous communication

I just checked, if the tests return "Received" for all messages it will not go into memory burst. Hence doing MPI_Test will be enough. :) Hence, if at any time the mpi-layer is notified about the success of a send/recv it will clean up. This makes sense :) See the updated code. 2014-09-18 13:39

Re: [OMPI users] About debugging and asynchronous communication

ok i have to wait until tomorrow, they have some problems with the network... On 09/18/2014 01:27 PM, Nick Papior Andersen wrote: I am not sure whether test will cover this... You should check it... I here attach my example script which shows two working cases, and one not workning (you

Re: [OMPI users] About debugging and asynchronous communication

I am not sure whether test will cover this... You should check it... I here attach my example script which shows two working cases, and one not workning (you can check the memory usage simultaneously and see that the first two works, the last one goes ballistic in memory). Just check it with

Re: [OMPI users] About debugging and asynchronous communication

Thanks very much for your reply! To Sir Jeff Squyres: I think it fails due to truncation errors. I am now logging information of each send and receive to find out the reason. To Sir Nick Papior Andersen: Oh, wait (mpi_wait) is never called in my codes. What I do is to call MPI_Irecv once.

Re: [OMPI users] About debugging and asynchronous communication

In complement to Jeff, I would add that using asynchronous messages REQUIRES that you wait (mpi_wait) for all messages at some point. Even though this might not seem obvious it is due to memory allocation "behind the scenes" which are only de-allocated upon completion through a wait statement.

Re: [OMPI users] About debugging and asynchronous communication

On Sep 18, 2014, at 2:43 AM, XingFENG wrote: > a. How to get more information about errors? I got errors like below. This > says that program exited abnormally in function MPI_Test(). But is there a > way to know more about the error? > > *** An error occurred in

Re: [OMPI users] About debugging and asynchronous communication

By the way, I am using Open MPI 1.6.5 and programming with C++. On Thu, Sep 18, 2014 at 4:43 PM, XingFENG wrote: > Dear all, > > I am new to MPI. Please forgive me if I ask a redundant question. > > I am now programming about graph processing using MPI. I get two

[OMPI users] About debugging and asynchronous communication

Dear all, I am new to MPI. Please forgive me if I ask a redundant question. I am now programming about graph processing using MPI. I get two problems as described below. a. How to get more information about errors? I got errors like below. This says that program exited abnormally in function