colvinco commented on PR #1320:
URL: https://github.com/apache/solr/pull/1320#issuecomment-1411718416
> A simplifying alternative would be to check gradle.properties into the
project (but still marked ignored in .gitignore) and with Gradle's own defaults
for number of workers & tests, or choose low ones. Advise users to edit them
according to their machine. We are overthinking this stuff today! This has dev
maintenance costs we pay right now. Generating this file is over-engineered IMO.
I would create a `gradle.properties.template` file that lives in source
control and copy it to the ignored `gradle.properties` path. That way it's easy
to update the template without messing around with gitignore.
I've taken a closer look at the properties file. Currently I see that only
two of the settings are generated dynamically, and the rest are all hardcoded.
```
// Approximate a common-sense default for running gradle/tests with
parallel
// workers: half the count of available cpus but not more than 12.
def cpus = Runtime.runtime.availableProcessors()
def maxWorkers = (int) Math.max(1d, Math.min(cpus * 0.5d, 12))
def testsJvms = (int) Math.max(1d, Math.min(cpus * 0.5d, 12))
...
# Maximum number of parallel gradle workers.
org.gradle.workers.max=${maxWorkers}
# Maximum number of test JVMs forked per test task.
tests.jvms=${testsJvms}
```
Getting the number of "processors" (depending on whether hyperthreading
counts...) shouldn't be a problem on bash,
https://stackoverflow.com/questions/6481005/how-to-obtain-the-number-of-cpus-cores-in-linux-from-the-command-line,
so I could still seed in those values.
I'm using Ubuntu in WSL:
```
me:~$ getconf _NPROCESSORS_ONLN
16
me:~$ nproc
16
me:~$ grep -c ^processor /proc/cpuinfo
16
me:~$ grep ^cpu\\scores /proc/cpuinfo | uniq | awk '{print $4}'
8
```
For Windows it's also possible:
https://pureinfotech.com/check-many-cores-processor-windows-10/
```
wmic cpu get NumberOfCores,NumberOfLogicalProcessors /format:value
NumberOfCores=8
NumberOfLogicalProcessors=16
```
`Runtime.runtime.availableProcessors()` gives the same answer as `nproc`,
but it was halved (and capped to 12). So I could just use the number of cores,
or divide `nproc`.
Doing the string replacement when copying the file in bash shouldn't be a
problem, I'll see if I can do it sensibly in batch as well.
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