Default the companion write sweep off (FEEDSIM_SWEEP_WN=0)

packages/feedsim/third_party/src/workloads/ranking/feature_extractors/generated/extractor_helpers.cpp

@@ -382,10 +382,10 @@ void initSweep() {
   // Companion write sweep: the read sweep above only adds read traffic, which
   // leaves feedsim's read:write ratio above prod's. FEEDSIM_SWEEP_WN streaming
   // writes/call over a separate DRAM-resident buffer raise the write share to
-  // move the ratio toward prod. Default 16 is a balanced cross-platform value;
-  // set FEEDSIM_SWEEP_WN=0 to disable (skips buffer allocation). Write
-  // stride/size default to the read knobs.
-  g_sweep.wn = envInt("FEEDSIM_SWEEP_WN", 16);
+  // move the ratio toward prod. Default 0 disables the sweep (no-op, skips
+  // buffer allocation); set FEEDSIM_SWEEP_WN>0 to enable. Write stride/size
+  // default to the read knobs.
+  g_sweep.wn = envInt("FEEDSIM_SWEEP_WN", 0);
   if (g_sweep.wn < 0) {
     g_sweep.wn = 0;
   }

packages/feedsim/third_party/src/workloads/ranking/feature_extractors/generated/extractor_helpers.h

@@ -137,9 +137,9 @@ float runStrideSweep(uint64_t seed);
 // separate buffer of FEEDSIM_SWEEP_WMB megabytes, stepping FEEDSIM_SWEEP_WSTRIDE
 // floats each write, to raise the write share of DRAM bandwidth toward prod's
 // read:write ratio. Streaming stores keep the traffic as pure writes (no
-// read-for-ownership). Knobs are read once from the environment; the default 16
-// is a balanced cross-platform value, and FEEDSIM_SWEEP_WN=0 disables the
-// sweep (no-op, skips buffer allocation). Write stride/size default to the read
+// read-for-ownership). Knobs are read once from the environment; the default 0
+// disables the sweep (no-op, skips buffer allocation) and FEEDSIM_SWEEP_WN>0
+// enables it. Write stride/size default to the read
 // knobs. Returns FEEDSIM_SWEEP_WN (cached after first call, which allocates the
 // write buffer).
 int sweepWritesPerCall();