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USE_JEMALLOC=OFF by default #17324
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USE_JEMALLOC=OFF by default #17324
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As of jemalloc 5, jemalloc default build can not be used in libraries that are dlopened. However, libmxnet.so is dlopened by Python (ctypes). To use MXNet with jemalloc 5, users must not to system libjemalloc.so but must rather link to a libjemalloc compiled with special parameters to allow dlopen to work. jemalloc 5 is distributed as part of Ubuntu 18.10 and higher, as well as Debian Stable. Users on these systems will be unable to compile MXNet with USE_JEMALLOC=ON.
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Should this be brought to the notice of dev community? I remember when certain build flag (MKLDNN/Large tensor) is to be toggled, it's discussed first. On other side, since this one toggles it off so I guess we can go ahead.. |
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Thanks, I will send a mail to dev. |
marcoabreu
approved these changes
Jan 19, 2020
szha
approved these changes
Jan 20, 2020
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szhengac
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Jan 21, 2020
apache#17324) As of jemalloc 5, jemalloc default build can not be used in libraries that are dlopened. However, libmxnet.so is dlopened by Python (ctypes). To use MXNet with jemalloc 5, users must not link to system libjemalloc.so but must rather link to a libjemalloc compiled with DISABLE_INITIAL_EXEC_TLS
szhengac
pushed a commit
to szhengac/mxnet
that referenced
this pull request
Jan 21, 2020
apache#17324) As of jemalloc 5, jemalloc default build can not be used in libraries that are dlopened. However, libmxnet.so is dlopened by Python (ctypes). To use MXNet with jemalloc 5, users must not link to system libjemalloc.so but must rather link to a libjemalloc compiled with DISABLE_INITIAL_EXEC_TLS
szhengac
pushed a commit
to szhengac/mxnet
that referenced
this pull request
Jan 21, 2020
apache#17324) As of jemalloc 5, jemalloc default build can not be used in libraries that are dlopened. However, libmxnet.so is dlopened by Python (ctypes). To use MXNet with jemalloc 5, users must not link to system libjemalloc.so but must rather link to a libjemalloc compiled with DISABLE_INITIAL_EXEC_TLS
szhengac
pushed a commit
to szhengac/mxnet
that referenced
this pull request
Jan 21, 2020
apache#17324) As of jemalloc 5, jemalloc default build can not be used in libraries that are dlopened. However, libmxnet.so is dlopened by Python (ctypes). To use MXNet with jemalloc 5, users must not link to system libjemalloc.so but must rather link to a libjemalloc compiled with DISABLE_INITIAL_EXEC_TLS
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Description
As of jemalloc 5, jemalloc default build can not be used in libraries that are dlopened. However, libmxnet.so is dlopened by Python (ctypes). To use MXNet with jemalloc 5, users must not to system libjemalloc.so but must rather link to a libjemalloc compiled with special parameters to allow dlopen to work.
jemalloc 5 is distributed as part of Ubuntu 18.10 and higher, as well as Debian Stable. Users on these systems will be unable to compile MXNet with USE_JEMALLOC=ON.
An alternative is to build jemalloc as part of our build. See #17121 for an implementation. Given the lack of review of #17121 and the reliance of a patched jemalloc version to allow integration into our build, let's first proceed with the current PR.
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