diff --git a/.gitignore b/.gitignore
index fb15ec0dbb5a2..3cbb42a1efd13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@
 *.jl.cov
 *.jl.*.cov
 *.jl.mem
+*.jl.*.mem
 *.ji
 
 /perf*
diff --git a/src/codegen.cpp b/src/codegen.cpp
index 3c2c6252bca63..fcbfd2deb12c2 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -1744,7 +1744,10 @@ extern "C" void jl_write_coverage_data(void)
 
 extern "C" void jl_write_malloc_log(void)
 {
-    write_log_data(mallocData, ".mem");
+    std::ostringstream stm;
+    stm << jl_getpid();
+    std::string outf = "." + stm.str() + ".mem";
+    write_log_data(mallocData, outf.c_str());
 }
 
 // --- constant determination ---