jasonmolenda wrote:
Hmmm, interesting. I built my optimized builds with
```
cmake ../llvm -G Ninja -DLLDB_ENABLE_SWIFT_SUPPORT=0
-DPython3_EXECUTABLE=/usr/bin/python3 -DCMAKE_BUILD_TYPE=RelWithDebInfo
-DLLVM_ENABLE_ASSERTIONS=1 -DLLVM_ENABLE_PROJECTS='llvm;lldb;clang'
'-DLLVM_ENABLE_RUNTIMES=libcxx;libcxxabi;libunwind' -DLLDB_ENABLE_PYTHON=1
```
I had the same `main` sources built with RelWithDebInfo, with Debug. Then I
applied this PR (110439)'s current diff and built RelWithDebInfo and Debug
("parallel") and then cleared my checkout, then applied the parallel+preload
current diff (110646) and built RelWithDebugInfo and Debug. Maybe I made a
mistake somewhere? I still have all of the build products on my computer. The
actual timings may be different because I'm not running a released version of
macOS on this computer, but the relative difference between my different
variations should be reliable.
You asked earlier what the times were like for one of the patched sources with
the setting enabled and disabled, I was going to note that. Here's exactly
what I saw with the RelWithDebInfo build of main plus the diff for this PR
("parallel"):
```
% time build.release.parallel/bin/lldb -x -b -o 'pro att -n Slack' -o 'det'
4.649u 2.614s 0:10.62 68.2% 0+0k 0+0io 3277pf+0w
% time build.release.parallel/bin/lldb -x -b -o 'pro att -n Slack' -o 'det'
4.581u 2.417s 0:10.57 66.1% 0+0k 0+0io 147pf+0w
% time build.release.parallel/bin/lldb -x -b -o 'pro att -n Slack' -o 'det'
4.534u 2.196s 0:09.92 67.7% 0+0k 0+0io 104pf+0w
```
and
```
% time build.release.parallel/bin/lldb -x -b -O 'settings set
plugin.experimental.dynamic-loader.darwin.enable-parallel-image-load true' -o
'pro att -n Slack' -o 'det'
6.621u 3.694s 0:06.00 171.8% 0+0k 0+0io 104pf+0w
% time build.release.parallel/bin/lldb -x -b -O 'settings set
plugin.experimental.dynamic-loader.darwin.enable-parallel-image-load true' -o
'pro att -n Slack' -o 'det'
6.562u 3.758s 0:06.15 167.6% 0+0k 0+0io 104pf+0w
% time build.release.parallel/bin/lldb -x -b -O 'settings set
plugin.experimental.dynamic-loader.darwin.enable-parallel-image-load true' -o
'pro att -n Slack' -o 'det'
6.562u 3.739s 0:06.19 166.2% 0+0k 0+0io 104pf+0w
```
`time` here is the tcsh time which is unlike all others lol, it is showing user
seconds, system seconds, elapsed (wallclock) seconds and cpu usage. I'm not
sure why it's consistently slower for me and not for you, that is surprising.
https://github.com/llvm/llvm-project/pull/110439
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