Add run-valgrind

This partially addresses tensorflow#69, but it requires us to build TensorFlow from source, which is too slow to do on Travis.

.gitignore

@@ -1,4 +1,5 @@
 *~
+*.log
 Cargo.lock
 target
 travis-ci/travis_rsa

Cargo.toml

@@ -19,6 +19,8 @@ random = "0.12"
 
 [features]
 tensorflow_unstable = []
+# This is for testing purposes; users should not use this.
+nightly = []
 
 [workspace]
 

examples/addition.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(feature="nightly", feature(alloc_system))]
+#[cfg(feature="nightly")]
+extern crate alloc_system;
 extern crate tensorflow;
 
 use std::error::Error;

examples/expressions.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(feature="nightly", feature(alloc_system))]
+#[cfg(feature="nightly")]
+extern crate alloc_system;
 extern crate random;
 extern crate tensorflow;
 

examples/regression.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(feature="nightly", feature(alloc_system))]
+#[cfg(feature="nightly")]
+extern crate alloc_system;
 extern crate random;
 extern crate tensorflow;
 

examples/regression_savedmodel.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(feature="nightly", feature(alloc_system))]
+#[cfg(feature="nightly")]
+extern crate alloc_system;
 extern crate random;
 extern crate tensorflow;
 

run-valgrind

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Runs valgrind and reports results.
+#
+# Since jemalloc dropped support for valgrind
+# (https://github.com/jemalloc/jemalloc/issues/369), and both Rust and TensorFlow
+# use jemalloc by default, we need to compile both without it.  Unfortunately,
+# compiling TensorFlow from source is expensive, so this script takes a long
+# time to run.
+
+cd $(dirname $(readlink -f "$0"))
+
+tensorflow_version=1.1.0
+
+valgrind_log=valgrind.log
+truncate --size=0 "$valgrind_log"
+
+# Disable jemalloc in TensorFlow.
+export TF_NEED_JEMALLOC=0
+
+# Disable jemalloc in Rust.
+export TF_RUST_BUILD_FROM_SRC=true
+
+# Don't need to rebuild the world, and `cargo clean --package tensorflow-sys` doesn't seem to do the job.
+rm -rf tensorflow/target tensorflow-sys/target
+
+# This is the very expensive step.
+cargo +nightly build --features=nightly -p tensorflow-sys -vv
+
+# Run valgrind against all the things.
+export LD_LIBRARY_PATH="$PWD"/tensorflow-sys/target/libtensorflow-cpu-linux-x86_64-$tensorflow_version/lib
+for example in addition regression expressions; do
+    cargo +nightly build --features='nightly tensorflow_unstable' --example="$example"
+    valgrind --leak-check=full target/debug/examples/"$example" >> "$valgrind_log" 2>&1
+done
+
+# Aggregate results.
+lost_bytes=$(awk '/(definitely|indirectly) lost:/{sum+=gensub(",","","g",$4)}END{print sum}' < "$valgrind_log")
+echo "Lost bytes: $lost_bytes"
+rel_log=$(readlink -f "$PWD"/"$valgrind_log")
+echo "For details, see $rel_log"