bug#74381: High memory usage during guix pull (i686-linux, guile jit)

[Dariqq]

Hi,

Using 'guix pull' on i686-linux regularly fails when building 
'guix-packages-base':

E.g this recent run on ci.guix.gnu.org: 
https://ci.guix.gnu.org/build/6472396/details

Log from me trying to pull 3e8d3d80f41e016cdfe80e488a78c2351c94fef8:

Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 8192 KiB
GC Warning: Failed to expand heap by 64 KiB
GC Warning: Out of Memory! Heap size: 3436 MiB. Returning NULL!
Warning: Unwind-only out of memory exception; skipping pre-unwind handler.
Warning: Unwind-only out of memory exception; skipping pre-unwind handler.
[ 19/ 20] compiling...	 90.0% of 10 filesallocating JIT code buffer 
failed: Cannot allocate memory
JIT failed due to resource exhaustion
disabling automatic JIT compilation
allocate_stack failed: Cannot allocate memory
Warning: Unwind-only stack overflow exception; skipping pre-unwind handler.
[...]

The error suggests this might be related to guile jit compiling things

Disabling it by adding GUILE_JIT_THRESHOLD=-1 to the guix-daemon 
environment got things working for me again.