Charm++ parallel programming system

[Emma White <emmawhite3897 AT gmail.com>]

Hello Nikhil, 

Thank you for your reply. 

I managed to use the LogAnalyzer tool from BigNetSim to convert the logs to a human readable format. I have some queries and would be deeply thankful if you could answer them. 

What is the definition of a Sequential Execution Block? 

What is the meaning of the following message names:

TCHARM_Get_nm_chun 

msgep

split-array-new

Why do are messages Group_Reduce, start_broadcast,split_broadcast,end_broadcast a part of the logs? Which statement gives rise to these messages? 

Thank you

                        

On Sun, Jul 16, 2017 at 11:47 AM, Nikhil Jain <nikhil.jain AT acm.org> wrote:

Emma,

Unfortunately, the documentation for writing a Bigsim trace-reader is not available. The example code here which is sometime used to view human readable form of the traces may be of use to you:

https://github.com/LLNL/tracer/blob/master/utils/traceHelp/traceToFile.cpp

There are 3 steps to reading the logs:

1. Loading summary (high level meta information) using BgLoadTraceSummary

2. Obtaining offsets for logs of different ranks using BgLoadOffsets

3. Loading part or all of logs for a rank using BgReadProc

Hope this helps.

---

Nikhil Jain
Postdoctoral Fellow, Lawrence Livermore National Laboratory
nikhil.jain AT acm.org, http://nikhil-jain.github.io/

On Jul 10, 2017, at 03:57, Emma White <emmawhite3897 AT gmail.com> wrote:

Hello,

I ran an MPI program with your Emulator with bglog and have got the trace files. I would like to read these trace files. Can you please give me some insight into how to use the loadlog tool?

Thanks a lot.

Emma