remove instruction counting in ci since it's unsupported

Author: acheronfail

justfile

@@ -100,10 +100,14 @@ measure what: (_check "bc hyperfine max_rss jq sponge")
   max_rss -ro STATS -- $(cat CMD)
   jq '. += {"max_rss": '$(cat STATS)'}' "$out" | sponge "$out"
 
-  perf_out=$(perf stat -x, -e cycles,instructions $(cat CMD) 2>&1 >/dev/null)
-  echo "$perf_out" | awk -F, '$3~/^cycles/{print $1}' > CYCLES
-  echo "$perf_out" | awk -F, '$3~/^instructions/{print $1}' > INSTRUCTIONS
-  jq '. += {"cycles": '$(cat CYCLES)',"instructions": '$(cat INSTRUCTIONS)'}' "$out" | sponge "$out"
+  if ! $CI; then
+    perf_out=$(perf stat -x, -e cycles,instructions $(cat CMD) 2>&1 >/dev/null)
+    echo "$perf_out" | awk -F, '$3~/^cycles/{print $1}' > CYCLES
+    echo "$perf_out" | awk -F, '$3~/^instructions/{print $1}' > INSTRUCTIONS
+    jq '. += {"cycles": '$(cat CYCLES)',"instructions": '$(cat INSTRUCTIONS)'}' "$out" | sponge "$out"
+  else
+    jq '. += {"cycles": null,"instructions": null}' "$out" | sponge "$out"
+  fi
 
 measure-all:
   #!/usr/bin/env bash