westonpace commented on pull request #11506:
URL: https://github.com/apache/arrow/pull/11506#issuecomment-949897509


   > @westonpace Do we have 32-bit ARM CI? Apparently this is one of the 
further complications...
   
   Ah, no, I don't think we do.
   
   >  (Or, where can I find this out myself?)
   
   Most of the CI jobs log out what kind of machine they are running on.  So 
look for a CI job named "ARM" and then look at the top of the log to see if you 
can find out more info.  In GH actions you have to google a bit about the 
default runners to learn more about the CPU they have.  For Travis CI there is 
a little blurb above the job 
   
![image](https://user-images.githubusercontent.com/1696093/138509474-5007211b-9415-4dc2-88d0-51ee13f268b0.png)
   
   It appears Travis CI runs on arm64 only.  However, while googling this just 
now, I did come across [this travis CI 
discussion](https://travis-ci.community/t/erlang-otp-21-1-4-is-missing-but-only-for-arm-64/6438/7)
 which suggests that Linux supports emulating arm32 on arm64 systems (using 
setarch).  It sounds like we could use that to create a 32-bit ARM build in 
Travis if we wanted to.


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