build: fix building with ninja #32071

richardlau · 2020-03-03T20:08:08Z

The ninja build places objects in a different directory.

Refs: #31981 (comment)

cc @gabrielschulhof

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
commit message follows commit guidelines

nodejs-github-bot · 2020-03-03T20:14:21Z

CI: https://ci.nodejs.org/job/node-test-pull-request/29520/

mmarchini · 2020-03-03T21:27:20Z

CI with --ninja: https://ci.nodejs.org/job/node-test-commit-linux/33212/nodes=centos7-64-gcc6/

gabrielschulhof

This breaks on Ubuntu 18.04.

gabrielschulhof · 2020-03-03T23:39:31Z

The file given needs to be the object file, not the static library.

gabrielschulhof · 2020-03-03T23:48:14Z

... and it needs to be the first file given to the linker.

gabrielschulhof · 2020-03-03T23:51:15Z

I mean, if you build with this change, it fails to find the mapping for large pages – probably because the value of __node_text_start is 0x0000000000000000, because the symbol is not linked in. That's why the object file needs to be passed to the linker directly, not via the static library.

gabrielschulhof · 2020-03-03T23:51:37Z

Is there a gyp variable holding the directory where object files are placed?

richardlau · 2020-03-03T23:52:54Z

Is there a gyp variable holding the directory where object files are placed?

<obj_dir>, but the location of the object files under that appear different when using ninja vs. make.

node/common.gypi

Lines 88 to 94 in 3d894d0

    
           ['GENERATOR == "ninja"', { 
        
             'obj_dir': '<(PRODUCT_DIR)/obj', 
        
             'v8_base': '<(PRODUCT_DIR)/obj/tools/v8_gypfiles/libv8_snapshot.a', 
        
           }, { 
        
             'obj_dir%': '<(PRODUCT_DIR)/obj.target', 
        
             'v8_base': '<(PRODUCT_DIR)/obj.target/tools/v8_gypfiles/libv8_snapshot.a', 
        
           }],

gabrielschulhof · 2020-03-03T23:59:55Z

@richardlau oh, so ninja doesn't do src/large_pages/node_text_start.o, meaning that it's the same as the path to the source file, but with .o?

gabrielschulhof · 2020-03-04T00:02:50Z

@richardlau we should then be able to use a condition like the one above to switch between the two paths, right?

richardlau · 2020-03-04T00:03:15Z

@richardlau we should then be able to use a condition like the one above to switch between the two paths, right?

I'm testing that right now.

gabrielschulhof · 2020-03-04T00:10:42Z

@richardlau can you also manually run node --use-largepages=on? It should not output failed to find text region.

gabrielschulhof · 2020-03-04T00:12:08Z

The test that runs node --use-largepages=on cannot be made to expect quiet on stderr, because mapping is fairly platform-dependent, and failure to map must not be fatal to the execution. Thus, the test only tests that Node.js successfully runs with the flag, not that it successfully maps with the flag.

richardlau · 2020-03-04T00:12:19Z

@richardlau can you also manually run node --use-largepages=on? It should not output failed to find text region.

I don't think my Linux environment has support for large pages (it prints Large pages are not enabled.).

gabrielschulhof · 2020-03-04T00:13:05Z

@richardlau

echo madvise > /sys/kernel/mm/transparent_hugepage/enabled

richardlau · 2020-03-04T00:14:19Z

@richardlau

echo madvise > /sys/kernel/mm/transparent_hugepage/enabled

@gabrielschulhof It's a shared development server so I almost certainly don't have permissions to do that.

gabrielschulhof · 2020-03-04T00:14:52Z

@richardlau OK, no problem. I can test on my machine when you push to this PR.

gabrielschulhof · 2020-03-04T00:16:52Z

@richardlau another good check is to examine the

g++ -o /home/nix/node/node/out/Release/node -pthread -rdynamic -m64 -Wl,--whole-archive...

line at the end of the build to make sure that node_text_start.o is the first file listed.

gabrielschulhof · 2020-03-04T00:17:47Z

@richardlau testing ...

richardlau · 2020-03-04T00:22:20Z

FTR with Ninja it looks like the object file is written to <(obj_dir)/src/large_pages/node_text_start.node_text_start.o.

with make:

  g++ -o /home/users/riclau/sandbox/github/nodejs/out/Release/node -pthread -rdynamic -m64 -Wl,--whole-archive /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/libnode.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_base_without_compiler.a -Wl,--no-whole-archive /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/node_text_start/src/large_pages/node_text_start.o -Wl,--whole-archive /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/zlib/libzlib.a -Wl,--no-whole-archive -Wl,--whole-archive /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/uv/libuv.a -Wl,--no-whole-archive -Wl,-z,noexecstack -Wl,--whole-archive /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_snapshot.a -Wl,--no-whole-archive -Wl,-z,relro -Wl,-z,now -Wl,--whole-archive,/home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/openssl/libopenssl.a -Wl,--no-whole-archive -pthread  -Wl,--start-group /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/node/src/node_main.o /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/node/gen/node_code_cache.o /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/node/gen/node_snapshot.o /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/histogram/libhistogram.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/uvwasi/libuvwasi.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/libnode.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/libnode_text_start.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_libplatform.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/icu/libicui18n.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/zlib/libzlib.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/llhttp/libllhttp.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/cares/libcares.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/uv/libuv.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/nghttp2/libnghttp2.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/brotli/libbrotli.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/deps/openssl/libopenssl.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_base_without_compiler.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/icu/libicuucx.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/icu/libicudata.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_libbase.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_libsampler.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_compiler.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_snapshot.a /home/users/riclau/sandbox/github/nodejs/out/Release/obj.target/tools/v8_gypfiles/libv8_initializers.a -lm -ldl -Wl,--end-group

and with ninja:

[60/60] c++ -pthread -rdynamic -m64 -Wl,--whole-archive obj/libnode.a obj/tools/v8_gypfiles/libv8_base_without_compiler.a -Wl,--no-whole-archive obj/src/large_pages/node_text_start.node_text_start.o -Wl,--whole-archive obj/deps/zlib/libzlib.a -Wl,--no-whole-archive -Wl,--whole-archive obj/deps/uv/libuv.a -Wl,--no-whole-archive -Wl,-z,noexecstack -Wl,--whole-archive obj/tools/v8_gypfiles/libv8_snapshot.a -Wl,--no-whole-archive -Wl,-z,relro -Wl,-z,now -Wl,--whole-archive,obj/deps/openssl/libopenssl.a -Wl,--no-whole-archive -pthread -o node -Wl,--start-group obj/gen/node.node_code_cache.o obj/gen/node.node_snapshot.o obj/src/node.node_main.o obj/deps/histogram/libhistogram.a obj/deps/uvwasi/libuvwasi.a obj/libnode.a obj/libnode_text_start.a obj/tools/v8_gypfiles/libv8_libplatform.a obj/tools/icu/libicui18n.a obj/deps/zlib/libzlib.a obj/deps/llhttp/libllhttp.a obj/deps/cares/libcares.a obj/deps/uv/libuv.a obj/deps/nghttp2/libnghttp2.a obj/deps/brotli/libbrotli.a obj/deps/openssl/libopenssl.a obj/tools/v8_gypfiles/libv8_base_without_compiler.a obj/tools/icu/libicuucx.a obj/tools/icu/libicudata.a obj/tools/v8_gypfiles/libv8_libbase.a obj/tools/v8_gypfiles/libv8_libsampler.a obj/tools/v8_gypfiles/libv8_compiler.a obj/tools/v8_gypfiles/libv8_snapshot.a obj/tools/v8_gypfiles/libv8_initializers.a  -lm -ldl -Wl,--end-group

gabrielschulhof · 2020-03-04T00:29:30Z

@richardlau argh! This works, but the command line changes:

g++
-o
/home/gschulho/node/out/Release/node
-pthread
-rdynamic
-m64
-Wl,--whole-archive
/home/gschulho/node/out/Release/obj.target/libnode.a
/home/gschulho/node/out/Release/obj.target/tools/v8_gypfiles/libv8_base_without_compiler.a
-Wl,--no-whole-archive
/home/gschulho/node/out/Release/obj.target/node_text_start/src/large_pages/node_text_start.o

so the ~~text~~object file gets placed after libnode.a and libv8_base_without_compiler.a and so the usefulness of the symbol is greatly diminished because it comes a lot later in the game. I don't understand why the switch to a condition has such a terrible effect.

I would like to test putting the condition in the variables section so that we can add the ldflags+ unconditionally. Maybe that'll please The GYP King™ 🤷

gabrielschulhof · 2020-03-04T00:56:15Z

Pushed one more minor change – to remove the trailing comma, thereby removing a superfluous diff.

nodejs-github-bot · 2020-03-04T01:06:32Z

CI: https://ci.nodejs.org/job/node-test-pull-request/29529/

MylesBorins

LGTM

MylesBorins · 2020-03-04T02:25:28Z

should this be fast-tracked?

gabrielschulhof · 2020-03-04T02:26:24Z

@MylesBorins I guess it does break the GitHub action, so it's probably a good idea.

The ninja build places objects in a different directory. Co-authored-by: Gabriel Schulhof <gabriel.schulhof@intel.com> Signed-off-by: Richard Lau <riclau@uk.ibm.com> PR-URL: nodejs#32071 Reviewed-By: Matheus Marchini <mat@mmarchini.me> Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

richardlau · 2020-03-04T04:58:10Z

Landed in de6cbd0.

The ninja build places objects in a different directory. Co-authored-by: Gabriel Schulhof <gabriel.schulhof@intel.com> Signed-off-by: Richard Lau <riclau@uk.ibm.com> PR-URL: #32071 Reviewed-By: Matheus Marchini <mat@mmarchini.me> Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

The ninja build places objects in a different directory. Co-authored-by: Gabriel Schulhof <gabriel.schulhof@intel.com> Signed-off-by: Richard Lau <riclau@uk.ibm.com> PR-URL: nodejs#32071 Reviewed-By: Matheus Marchini <mat@mmarchini.me> Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

targos · 2020-04-20T19:54:10Z

Depends on #31981 to land on v12.x

The ninja build places objects in a different directory. Co-authored-by: Gabriel Schulhof <gabriel.schulhof@intel.com> Signed-off-by: Richard Lau <riclau@uk.ibm.com> Backport-PR-URL: nodejs#32092 PR-URL: nodejs#32071 Reviewed-By: Matheus Marchini <mat@mmarchini.me> Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

The ninja build places objects in a different directory. Co-authored-by: Gabriel Schulhof <gabriel.schulhof@intel.com> Signed-off-by: Richard Lau <riclau@uk.ibm.com> Backport-PR-URL: #32092 PR-URL: #32071 Reviewed-By: Matheus Marchini <mat@mmarchini.me> Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

nodejs-github-bot added the build Issues and PRs related to build files or the CI. label Mar 3, 2020

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src: start the .text section with an asm symbol #31981

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richardlau force-pushed the largepages branch from 4a65610 to 42f1d92 Compare March 4, 2020 00:17

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richardlau force-pushed the largepages branch from 3d59b9c to de6cbd0 Compare March 4, 2020 04:51

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[v10.x] Backport large pages to v10.x #31105

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v13.10.1 proposal #32099

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v12.17.0 release proposal #33197

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