performance doc enhancements

1 files changed, 8 insertions, 0 deletions

diff --git a/docs/perf_tips.txt b/docs/perf_tips.txt
index 215895b6..2fa19234 100644
--- a/docs/perf_tips.txt
+++ b/docs/perf_tips.txt
@@ -50,6 +50,9 @@ Even if you don't have a lightweight harness for a particular target, remember
 that you can always use another, related library to generate a corpus that will
 be then manually fed to a more resource-hungry program later on.
 
+Also note that reading the fuzzing input via stdin is faster than reading from
+a file.
+
 3) Use LLVM instrumentation
 ---------------------------
 
@@ -161,6 +164,11 @@ and not waste CPU time.
 
 There are several OS-level factors that may affect fuzzing speed:
 
+  - If you have no risk of power loss then run your fuzzing on a tmpfs
+    partition. This increases the performance noticably.
+    Alternatively you can use AFL_TMPDIR to point to a tmpfs location to
+    just write the input file to a tmpfs.
+
   - High system load. Use idle machines where possible. Kill any non-essential
     CPU hogs (idle browser windows, media players, complex screensavers, etc).