使用gdb在多个屏幕窗口中调试MPI [英] Use gdb to debug MPI in multiple screen windows
问题描述
如果我有一个我想用gdb调试的MPI程序，同时能够看到所有单独的进程的输出，我可以使用：
mpirun -n xterm -hold -e gdb -ex run --args ./program [arg1] [arg2] [...]
当我有一个图形用户界面可以玩的时候，这非常好。但是情况并非总是如此。
是否有类似的设置可用于 screen ，这样每个进程都有自己的窗口？这对于在远程环境中进行调试非常有用，因为它允许我使用 Ctrl + an 来在输出之间切换。
一种方法是启动每个
进程都有一个单独的终端和gdb会话：
mpirun -n xterm -hold -e gdb -ex run --args ./program [arg1] [arg2] [...]
其中 NP 是进程数量。
如果您不有一个图形用户界面方便？
（见下面的一个方便的脚本。）
这是基于timofiend的答案此处。
分开mpi程序在其调试器中进行多次屏幕会话：
mpirun -np 4屏幕-AdmS mpi gdb ./parallel_pit_fill.exe一个保留./beauford.tif 500 500
启动一个新的屏幕会话以访问调试器：
screen -AdmS debug
将调试器的屏幕会话加载到新的屏幕会话中
screen -list | ＃获取屏幕会话列表
grep -E[0-9] +。mpi| ＃提取相关的
awk'{print NR-1，$ 1}'| ＃生成选项卡＃和会话ID，删除字符串的其余部分
xargs -n 2 sh -c'
screen -S调试-X屏幕-t选项卡$ 0屏幕-r $ 1
'
跳转到新屏幕会话：
screen -r debug
我已经封装了上面的一个方便的脚本：
＃！/ bin / bash
if [$＃-lt 2]
然后
echoParallel Debugger Syntax：$ 0< NP>< PROGRAM> [arg1] [arg2] [...]
exit 1
fi
the_time =`date +％s`＃使用这个，所以我们可以一次运行多个调试会话
＃（假设我们只是每秒启动一次）
＃第一个参数是进程数。其他一切都是我们希望
＃运行的。为每个进程创建一个新的mpi屏幕。
mpirun -np $ 1屏幕-AdmS $ {the_time} .mpi gdb$ {@：2}
＃从
创建一个新的调试屏幕-AdmS $ {the_time} .debug
＃以下内容用于将调试器载入调试屏幕
firstpart =screen -S $ {the_time} .debug
secondpart =' -X屏幕-t选项卡$ 0屏幕-r $ 1'
screen -list | ＃获取mpi屏幕列表
grep -E[0-9] +。$ {the_time} .mpi| ＃提取相关的
awk'{print NR-1，$ 1}'| ＃生成选项卡＃和会话标识符，删除字符串的其余部分
xargs -n 2 sh -c$ firstpart $ secondpart
screen -r $ {the_time} .debug #Enter调试屏幕
If I have an MPI program that I want to debug with gdb while being able to see all of the separate processes' outputs, I can use:
mpirun -n <NP> xterm -hold -e gdb -ex run --args ./program [arg1] [arg2] [...]
which is well and good when I have a GUI to play with. But that is not always the case.
Is there a similar set up I can use with screen such that each process gets its own window? This would be useful for debugging in a remote environment since it would allow me to flip between outputs using Ctrl+a n.
How do you debug a C/C++ MPI program?
One way is to start a separate terminal and gdb session for each of the processes:
mpirun -n <NP> xterm -hold -e gdb -ex run --args ./program [arg1] [arg2] [...]
where NP is the number of processes.
What if you don't have a GUI handy?
(See below for a handy script.)
This is based on timofiend's answer here.
Spin up the mpi program in its debugger in a number of screen sessions:
mpirun -np 4 screen -AdmS mpi gdb ./parallel_pit_fill.exe one retain ./beauford.tif 500 500
Spin up a new screen session to access the debugger:
screen -AdmS debug
Load the debugger's screen sessions in to the new screen session
screen -list | #Get list of screen sessions
grep -E "[0-9]+.mpi" | #Extract the relevant ones
awk '{print NR-1,$1}' | #Generate tab #s and session ids, drop rest of the string
xargs -n 2 sh -c '
screen -S debug -X screen -t tab$0 screen -r $1
'
Jump into the new screen session:
screen -r debug
I've encapsulated the above in a handy script:
#!/bin/bash
if [ $# -lt 2 ]
then
echo "Parallel Debugger Syntax: $0 <NP> <PROGRAM> [arg1] [arg2] [...]"
exit 1
fi
the_time=`date +%s` #Use this so we can run multiple debugging sessions at once
#(assumes we are only starting one per second)
#The first argument is the number of processes. Everything else is what we want
#to run. Make a new mpi screen for each process.
mpirun -np $1 screen -AdmS ${the_time}.mpi gdb "${@:2}"
#Create a new screen for debugging from
screen -AdmS ${the_time}.debug
#The following are used for loading the debuggers into the debugging screen
firstpart="screen -S ${the_time}.debug"
secondpart=' -X screen -t tab$0 screen -r $1'
screen -list | #Get list of mpi screens
grep -E "[0-9]+.${the_time}.mpi" | #Extract the relevant ones
awk '{print NR-1,$1}' | #Generate tab #s and session ids, drop rest of the string
xargs -n 2 sh -c "$firstpart$secondpart"
screen -r ${the_time}.debug #Enter debugging screen
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