Adds benchmarks for nallocx, calloc, alloc, alloc_excess, ralloc, ralloc_excess (gnzlbg#26)

* [bench] nallocx cost

* [jemalloc-sys] detect jemalloc/configure

* [bench] calloc cost

* [bench] alloc/dealloc round-trip

* [bench] alloc_excess when the excess is used/unused

* [jemalloc-sys] detect unsupported targets

* [bench] add test::black_box(ptr) on all benches

* [bench] realloc

* [bench] realloc_excess

* [bench] run benchmarks only on x86_64-unknown-linux-gnu

* move all benchmarks into one file

* remove benchmark build from travis

* remove checks in jemalloc-sys/build.rs for missing configure file

* docs

* fix calloc bench

Author: gnzlbg

.travis.yml

@@ -22,10 +22,8 @@ matrix:
       after_success:
         - travis-cargo --only nightly doc-upload
 
-before_script:
-  - if [ -z "$NO_ADD" ]; then rustup target add $TARGET; fi
-
 script:
+  - if [ -z "$NO_ADD" ]; then rustup target add $TARGET; fi
   - cargo run --target $TARGET --manifest-path systest/Cargo.toml
   - cargo build --target $TARGET
   - cargo build --target $TARGET --features profiling

Cargo.toml

@@ -14,6 +14,7 @@ A Rust allocator backed by jemalloc
 
 [lib]
 test = false
+bench = false
 
 [workspace]
 members = ["systest"]