Make RecordIn/RecordOut human readable

Summary: I had hard time understanding these big numbers. Here's how the output looks like now: https://gist.github.com/igorcanadi/4c39c17685049584a992

Test Plan: db_bench

Reviewers: sdong, MarkCallaghan

Reviewed By: MarkCallaghan

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D35073

db/internal_stats.cc

@@ -33,9 +33,9 @@ void PrintLevelStatsHeader(char* buf, size_t len, const std::string& cf_name) {
       "Level   Files   Size(MB) Score Read(GB)  Rn(GB) Rnp1(GB) "
       "Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) "
       "Comp(sec) Comp(cnt) Avg(sec) "
-      "Stall(cnt)    RecordIn   RecordDrop\n"
-      "--------------------------------------------------------------------"
+      "Stall(cnt)  KeyIn KeyDrop\n"
       "--------------------------------------------------------------------"
+      "-----------------------------------------------------------"
       "--------------------------------------\n",
       cf_name.c_str());
 }
@@ -47,6 +47,9 @@ void PrintLevelStats(char* buf, size_t len, const std::string& name,
   uint64_t bytes_read = stats.bytes_readn + stats.bytes_readnp1;
   int64_t bytes_new = stats.bytes_written - stats.bytes_readnp1;
   double elapsed = (stats.micros + 1) / 1000000.0;
+  std::string num_input_records = NumberToHumanString(stats.num_input_records);
+  std::string num_dropped_records =
+      NumberToHumanString(stats.num_dropped_records);
 
   snprintf(buf, len,
            "%4s %5d/%-3d %8.0f %5.1f " /* Level, Files, Size(MB), Score */
@@ -59,27 +62,24 @@ void PrintLevelStats(char* buf, size_t len, const std::string& name,
            "%5.1f "                    /* W-Amp */
            "%8.1f "                    /* Rd(MB/s) */
            "%8.1f "                    /* Wr(MB/s) */
-           "%9.0f "                   /* Comp(sec) */
+           "%9.0f "                    /* Comp(sec) */
            "%9d "                      /* Comp(cnt) */
            "%8.3f "                    /* Avg(sec) */
            "%10" PRIu64
            " "      /* Stall(cnt) */
-           "%12" PRIu64
-           " " /* input entries */
-           "%12" PRIu64 "\n" /* number of records reduced */,
+           "%7s "   /* KeyIn */
+           "%6s\n", /* KeyDrop */
            name.c_str(), num_files, being_compacted, total_file_size / kMB,
            score, bytes_read / kGB, stats.bytes_readn / kGB,
            stats.bytes_readnp1 / kGB, stats.bytes_written / kGB,
            bytes_new / kGB, stats.bytes_moved / kGB,
            w_amp, bytes_read / kMB / elapsed,
-           stats.bytes_written / kMB / elapsed,
-           stats.micros / 1000000.0, stats.count,
+           stats.bytes_written / kMB / elapsed, stats.micros / 1000000.0,
+           stats.count,
            stats.count == 0 ? 0 : stats.micros / 1000000.0 / stats.count,
            stalls,
-           stats.num_input_records, stats.num_dropped_records);
+           num_input_records.c_str(), num_dropped_records.c_str());
 }
-
-
 }
 
 DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,

util/logging.cc

@@ -13,6 +13,7 @@
 #define __STDC_FORMAT_MACROS
 #endif
 
+#include <cmath>
 #include <inttypes.h>
 #include <errno.h>
 #include <stdarg.h>
@@ -95,6 +96,21 @@ std::string NumberToString(uint64_t num) {
   return r;
 }
 
+std::string NumberToHumanString(int64_t num) {
+  char buf[16];
+  int64_t absnum = num < 0 ? -num : num;
+  if (absnum < 10000) {
+    snprintf(buf, sizeof(buf), "%" PRIi64, num);
+  } else if (absnum < 10000000) {
+    snprintf(buf, sizeof(buf), "%" PRIi64 "K", num / 1000);
+  } else if (absnum < 10000000000LL) {
+    snprintf(buf, sizeof(buf), "%" PRIi64 "M", num / 1000000);
+  } else {
+    snprintf(buf, sizeof(buf), "%" PRIi64 "G", num / 1000000000);
+  }
+  return std::string(buf);
+}
+
 std::string EscapeString(const Slice& value) {
   std::string r;
   AppendEscapedStringTo(&r, value);

util/logging.h

@@ -33,9 +33,15 @@ extern void AppendNumberTo(std::string* str, uint64_t num);
 // Escapes any non-printable characters found in "value".
 extern void AppendEscapedStringTo(std::string* str, const Slice& value);
 
-// Return a human-readable printout of "num"
+// Return a string printout of "num"
 extern std::string NumberToString(uint64_t num);
 
+// Return a human-readable version of num.
+// for num >= 10.000, prints "xxK"
+// for num >= 10.000.000, prints "xxM"
+// for num >= 10.000.000.000, prints "xxG"
+extern std::string NumberToHumanString(int64_t num);
+
 // Return a human-readable version of "value".
 // Escapes any non-printable characters found in "value".
 extern std::string EscapeString(const Slice& value);