Revert "Mark x86 CI as xfail"

.github/workflows/CI.yml

@@ -124,7 +124,7 @@ jobs:
           JULIA_PKG_SERVER_REGISTRY_PREFERENCE: eager
       - uses: julia-actions/julia-runtest@v1
         if: matrix.version != 'nightly' || steps.buildpkg.outcome == 'success'
-        continue-on-error: ${{ matrix.version == 'nightly' || matrix.arch == 'x86' }}
+        continue-on-error: ${{ matrix.version == 'nightly' }}
         id: run_tests
         # TODO restore coverage post https://github.com/JuliaGPU/GPUCompiler.jl/pull/711
         with:

test/runtests.jl

@@ -118,10 +118,22 @@ else
     end
 end
 
+#Always set the max rss so that if tests add large global variables (which they do) we don't make the GC's life too hard
+if Sys.WORD_SIZE == 64
+    const JULIA_TEST_MAXRSS_MB = 3800
+else
+    # Assume that we only have 3.5GB available to a single process, and that a single
+    # test can take up to 2GB of RSS.  This means that we should instruct the test
+    # framework to restart any worker that comes into a test set with 1.5GB of RSS.
+    const JULIA_TEST_MAXRSS_MB = 1536
+end
+
+const max_worker_rss = JULIA_TEST_MAXRSS_MB * 2^20
+
 # determine parallelism
 if !set_jobs
     jobs = Sys.CPU_THREADS
-    memory_jobs = Int(Sys.free_memory()) ÷ (2 * 2^30)
+    memory_jobs = Int64(Sys.free_memory()) ÷ (2 * 2^30)
     jobs = max(1, min(jobs, memory_jobs))
 end
 @info "Running $jobs tests in parallel. If this is too many, specify the `--jobs` argument to the tests, or set the `JULIA_CPU_THREADS` environment variable."
@@ -298,6 +310,11 @@ try
                         p = recycle_worker(p)
                     else
                         print_testworker_stats(test, wrkr, resp)
+                        if resp[end] > max_worker_rss
+                            # the worker has reached the max-rss limit, recycle it
+                            # so future tests start with a smaller working set
+                            p = recycle_worker(p)
+                        end
                     end
                 end