在 MPI 程序中使用 pthread 会出现编译错误

Question

我正在尝试运行一个使用 pthread 的 MPI 程序。我可以在我的本地机器上编译和运行，但不能在服务器上这样做。

这是我用来编译的命令。

target1: TARGET=main
target2: TARGET=kmer_finaliser

CC = mpic++
# CPPFLAGS = -pg 
# CPPFLAGS = -lm -g -Wall -pthread
CPPFLAGS = -std=c++11 -pthread

USER_LIBS = -I /home/ruchin/sparsehash-sparsehash-2.0.4/src 

main: main.o extractor.o com.o kmer_dump.o thread_pool.o
    $(CC) $(CPPFLAGS) -o kmer_counter.out main.o extractor.o com.o kmer_dump.o thread_pool.o $(USER_LIBS)

main.o: main.cpp extractor.h com.h kmer_dump.h thread_pool.h
    $(CC) $(CPPFLAGS) -c main.cpp $(USER_LIBS)

kmer_finaliser: kmer_finaliser.o kmer_dump.o
    $(CC) $(CPPFLAGS) -o kmer_finaliser.out kmer_finaliser.o kmer_dump.o $(USER_LIBS)

kmer_finaliser.o: kmer_finaliser.cpp kmer_dump.h
    $(CC) $(CPPFLAGS) -c kmer_finaliser.cpp $(USER_LIBS)

extractor.o: extractor.cpp extractor.h
    $(CC) $(CPPFLAGS) -c extractor.cpp $(USER_LIBS)

com.o: com.cpp com.h
    $(CC) $(CPPFLAGS) -c com.cpp $(USER_LIBS)

kmer_dump.o: kmer_dump.cpp kmer_dump.h
    $(CC) $(CPPFLAGS) -c kmer_dump.cpp $(USER_LIBS)

thread_pool.o: thread_pool.cpp kmer_dump.h
    $(CC) $(CPPFLAGS) -c thread_pool.cpp $(USER_LIBS)

这是我得到的错误。

/usr/bin/ld: thread_pool.o: undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'
/lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Answer 1

根据man page of g++，您还应该在编译中包含标志-pthread：

-pthread 定义使用 POSIX 线程所需的附加宏 图书馆。您应该一致地使用此选项 编译和链接。此选项受支持 GNU/Linux 目标，大多数其他 Unix 衍生产品，以及 x86 Cygwin 和 MinGW 目标。