Hi,

thanks for the comments. LGTM after updating a commit message.

Sergey

Hi, Sergey!
Thanks for the review!
Please consider my answers below.

On 28.04.26, Sergey Bronnikov wrote:

Hi, Sergey!

A few things worry me: we still don't know the root cause of the problem.

It should be investigated and fixed in the scope of the 12600 [1]. For
LuaJIT's CI, this workaround works just fine.

The proposed patch merely reduces the frequency of module installations.

Yes, it installs the module only once.

And if an installation is required, the installation will still break.

Not always, it usually passes successfully and fails only on the fourth
run. So, 1 successful installation is enough to prevent flakiness, which
is OK for our needs in LuaJIT. It is better to have some statistics
instead of having none, isn't it?

See comments inline.

Sergey

On 4/23/26 20:08, Sergey Kaplun wrote:

We have encountered the flakiness of the network on our CI runners. It
happens only on lua-cjson installation and only in some particular job
run.

This patch helps to deal with it by installing this package only if it

s/helps to deal with it/helps to reduce a number of installations/

Don't get the comment about the number of installations. Maybe rephrase
it like the following?
| This patch workarounds it by installing the package only if ...

Ok, let's rephrase like you suggested. 

Also, it is worth referring to the issue #12600 ("See also #12600").

is not installed in the system. Also, it installs it only for Lua 5.1,
which is compatible with LuaJIT.
---

Branch:https://github.com/tarantool/luajit/tree/skaplun/ci-perf-install-conditionally-lua-cjson

  .github/actions/setup-performance/action.yml | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.github/actions/setup-performance/action.yml b/.github/actions/setup-performance/action.yml
index 4e0e1929..3c2a8230 100644
--- a/.github/actions/setup-performance/action.yml
+++ b/.github/actions/setup-performance/action.yml
@@ -11,7 +11,9 @@ runs:
          apt install -y curl luarocks util-linux
        shell: bash
      - name: Install Lua modules
-      run: luarocks install lua-cjson
+      run: >
+        luarocks --lua-version=5.1 show lua-cjson ||
+        luarocks --lua-version=5.1 install lua-cjson

Why do we need specifying Lua version now? Previously, it worked without 
setting exact version.

I've preferred to describe it specifically since the most modern distros
provide Lua 5.3+ by default. Should I add the comment in the commit
message?

        shell: bash
      - name: Run script to setup Linux environment
        run: sh ./perf/helpers/setup_env.sh

[1]: https://github.com/tarantool/tarantool/issues/12600