enabling pgo

[octaviansoldea]

• Version: v11.0.0-pre
• Platform: Linux
• Subsystem:

Hello

This is about enabling pgo compilation. This issue, is also related to a previous effort:

#1409

In this context, I would like to initiate a pull request and ask the community feedback. From some preliminary results, I have the following data:

I have compared Node-DC-EIS and Ghost, and have obtained 3.7% and 3.8% improvements respectively. These numbers were validated with unpaired t-test. Moreover, I am collecting data regarding the Node.js benchmark suite and attached here two of the benchmarks:

assert_compare.txt
async_hooks_compare.txt

In this context, I would like to mention that assert and async manifest 3.17% and 3.92% improvements respectively.

The experiments were done on Intel(R) Xeon(R) Platinum 8180 CPU @ 2.50GHz. Nevertheless, the solution I would like to submit passes the tests, and also compiles for 32 bits, see also issue 1409.

I am looking forward to hearing from you.

@octaviansoldea

[Trott]

@nodejs/build

[bnoordhuis]

Do you want to add a configure option or enable PGO in release builds? The former isn't controversial and will likely be accepted. The latter still has the issue of a lack of comprehensive benchmarks.

Node-DC-EIS and Ghost are realistic workloads but using them as inputs could penalize e.g. build tool-esque workloads (gulp, webpack, etc.)

I'd start with the configure option because prepping the build system needs to happen anyway.

[mhdawson]

+1 to starting with configure option.

[octaviansoldea]

Hello

Thank you for your feedback. My solution is including configure indeed.

@octaviansoldea

[octaviansoldea]

Hello

Just a small update. I have uploaded the modification proposed and created the pull request

pgo: enabling pgo at configure #21596

@octaviansoldea

[octaviansoldea]

Hello

I am uploading here the rest of the files obtained at running the Node.js benchmark suite.
Please note that the profiling was done on Node-DC-EIS.

@octaviansoldea

arrays_compare.txt
buffers_compare.txt
child_process_compare.txt
cluster_compare.txt
crypto_compare.txt
dgram_compare.txt
dns_compare.txt
domain_compare.txt
es_compare.txt
events_compare.txt
fs_compare.txt
http2_compare.txt
http_compare.txt
misc_compare.txt
module_compare.txt
net_compare.txt
os_compare.txt
path_compare.txt
process_compare.txt
querystring_compare.txt
streams_compare.txt
string_decoder_compare.txt
timers_compare.txt
tls_compare.txt
url_compare.txt
util_compare.txt
v8_compare.txt
vm_compare.txt
zlib_compare.txt

[lundibundi]

Closed via #21596.

Using PGO for release builds may be an idea worth discussion but this issue has concerned the ability to use PGO on Linux.