Add zlib to our builds and tweak histogram output

Summary:
$SUBJECT -- cosmetic fix for histograms, print P75/P99, and
make sure zlib is enabled for our command line tools.

Test Plan: compile, test db_bench with --compression_type=zlib

Reviewers: heyongqiang

Reviewed By: heyongqiang

CC: adsharma, leveldb

Differential Revision: https://reviews.facebook.net/D8445

fbcode.gcc471.sh

@@ -23,6 +23,10 @@ fi
 SNAPPY_INCLUDE=" -I $TOOLCHAIN_LIB_BASE/snappy/snappy-1.0.3/7518bbe/include"
 SNAPPY_LIBS=" $TOOLCHAIN_LIB_BASE/snappy/snappy-1.0.3/7518bbe/lib/libsnappy.a"
 
+# location of zlib headers and libraries
+ZLIB_INCLUDE=" -I $TOOLCHAIN_LIB_BASE/zlib/zlib-1.2.5/91ddd43/include"
+ZLIB_LIBS=" $TOOLCHAIN_LIB_BASE/zlib/zlib-1.2.5/91ddd43/lib/libz.a"
+
 # location of boost headers and libraries
 THRIFT_INCLUDE=" -I $TOOLCHAIN_LIB_BASE/boost/boost-1.48.0/bef9365/include -std=gnu++0x"
 THRIFT_INCLUDE+=" -I./thrift -I./thrift/gen-cpp -I./thrift/lib/cpp"
@@ -36,7 +40,7 @@ LIBEVENT_LIBS=" -L $TOOLCHAIN_LIB_BASE/libevent/libevent-1.4.14b/91ddd43/lib"
 export USE_SSE=" -msse -msse4.2 "
 
 CC="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.7.1-glibc-2.14.1/bin/gcc"
-CXX="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.7.1-glibc-2.14.1/bin/g++ $JINCLUDE $SNAPPY_INCLUDE $THRIFT_INCLUDE $LIBEVENT_INCLUDE"
+CXX="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.7.1-glibc-2.14.1/bin/g++ $JINCLUDE $SNAPPY_INCLUDE $ZLIB_INCLUDE $THRIFT_INCLUDE $LIBEVENT_INCLUDE"
 AR=$TOOLCHAIN_EXECUTABLES/binutils/binutils-2.21.1/da39a3e/bin/ar
 RANLIB=$TOOLCHAIN_EXECUTABLES/binutils/binutils-2.21.1/da39a3e/bin/ranlib
 
@@ -45,11 +49,11 @@ CFLAGS+=" -I $TOOLCHAIN_LIB_BASE/jemalloc/$TOOL_JEMALLOC/include -DHAVE_JEMALLOC
 
 EXEC_LDFLAGS=" -Wl,--whole-archive $TOOLCHAIN_LIB_BASE/jemalloc/$TOOL_JEMALLOC/lib/libjemalloc.a"
 EXEC_LDFLAGS+=" -Wl,--no-whole-archive $TOOLCHAIN_LIB_BASE/libunwind/libunwind-20100812_experimental/91ddd43/lib/libunwind.a"
-EXEC_LDFLAGS+=" $HDFSLIB $SNAPPY_LIBS $THRIFT_LIBS $LIBEVENT_LIBS"
+EXEC_LDFLAGS+=" $HDFSLIB $SNAPPY_LIBS $ZLIB_LIBS $THRIFT_LIBS $LIBEVENT_LIBS"
 
 PLATFORM_LDFLAGS="-L$TOOLCHAIN_LIB_BASE/libgcc/libgcc-4.7.1/afc21dc/lib -L$TOOLCHAIN_LIB_BASE/glibc/glibc-2.14.1/99df8fc/lib"
 
-EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS"
-SNAPPY_LDFLAGS="$SNAPPY_LIBS"
+EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS"
+SNAPPY_LDFLAGS="$SNAPPY_LIBS $ZLIB_LIBS"
 
 export CC CXX AR RANLIB CFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED SNAPPY_LDFLAGS

util/histogram.cc

@@ -150,6 +150,10 @@ std::string Histogram::ToString() const {
            "Min: %.4f  Median: %.4f  Max: %.4f\n",
            (num_ == 0.0 ? 0.0 : min_), Median(), max_);
   r.append(buf);
+  snprintf(buf, sizeof(buf),
+           "Percentiles: P50: %.2f P75: %.2f P99: %.2f P99.9: %.2f\n",
+           Percentile(50), Percentile(75), Percentile(99), Percentile(99.9));
+  r.append(buf);
   r.append("------------------------------------------------------\n");
   const double mult = 100.0 / num_;
   double sum = 0;
@@ -157,7 +161,7 @@ std::string Histogram::ToString() const {
     if (buckets_[b] <= 0.0) continue;
     sum += buckets_[b];
     snprintf(buf, sizeof(buf),
-             "[ %ld, %ld ) %ld %7.3f%% %7.3f%% ",
+             "[ %7ld, %7ld ) %8ld %7.3f%% %7.3f%% ",
              ((b == 0) ? 0 : bucketMapper.BucketLimit(b-1)),      // left
              bucketMapper.BucketLimit(b),                           // right
              buckets_[b],                             // count