[mpich-discuss] read the same file on all processes

[Kamaraju Kusumanchi]

of the order of 10MB. How does the approach change as the size
increases/decreases?

raju

On Tue, Oct 21, 2008 at 10:10 PM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:
> How big is the file? What kind of file system is it on?
>
> Rajeev
>
>> -----Original Message-----
>> From: owner-mpich-discuss at mcs.anl.gov
>> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of
>> Kamaraju Kusumanchi
>> Sent: Tuesday, October 21, 2008 8:27 PM
>> To: mpich-discuss at mcs.anl.gov
>> Subject: [mpich-discuss] read the same file on all processes
>>
>> Hi all,
>>
>>     I have a file which needs to be read on all the processes
>> of an MPI job. If I read the same file simultaneously on all
>> the processes, will it cause any problems?
>>
>>     I can think of two other options such as
>>
>> - make multiple copies of the same file and read a separate
>> file on different processes
>> - read the file on rank 0 process, then use MPI_Bcast and
>> transfer the contents across the remaining processes.
>>
>>    Which approach should be preferred? I am thinking this
>> must be something encountered by others. So, if there is a
>> book/web page which explains these kind of things, a pointer
>> to them would be most appreciated.
>>
>> regards
>> raju
>>
>>
>
>