add manual flag to mmap dictionary

programs/zstdcli.c

@@ -254,6 +254,7 @@ static void usage_advanced(const char* programName)
 
     DISPLAYOUT("\n");
     DISPLAYOUT("  --format=zstd                 Compress files to the `.zst` format. [Default]\n");
+    DISPLAYOUT("  --mmap-dict                   Memory-map dictionary file rather than mallocing and loading all at once");
 #ifdef ZSTD_GZCOMPRESS
     DISPLAYOUT("  --format=gzip                 Compress files to the `.gz` format.\n");
 #endif
@@ -850,7 +851,8 @@ int main(int argCount, const char* argv[])
         showDefaultCParams = 0,
         ultra=0,
         contentSize=1,
-        removeSrcFile=0;
+        removeSrcFile=0,
+        mmapDict=0;
     ZSTD_paramSwitch_e useRowMatchFinder = ZSTD_ps_auto;
     FIO_compressionType_t cType = FIO_zstdCompression;
     unsigned nbWorkers = 0;
@@ -984,6 +986,7 @@ int main(int argCount, const char* argv[])
                 if (longCommandWArg(&argument, "--adapt=")) { adapt = 1; if (!parseAdaptParameters(argument, &adaptMin, &adaptMax)) { badusage(programName); CLEAN_RETURN(1); } continue; }
                 if (!strcmp(argument, "--single-thread")) { nbWorkers = 0; singleThread = 1; continue; }
                 if (!strcmp(argument, "--format=zstd")) { suffix = ZSTD_EXTENSION; cType = FIO_zstdCompression; continue; }
+                if (!strcmp(argument, "--mmap-dict")) { mmapDict = 1; continue; }
 #ifdef ZSTD_GZCOMPRESS
                 if (!strcmp(argument, "--format=gzip")) { suffix = GZ_EXTENSION; cType = FIO_gzipCompression; continue; }
                 if (exeNameMatch(programName, ZSTD_GZ)) {     /* behave like gzip */
@@ -1526,6 +1529,7 @@ int main(int argCount, const char* argv[])
     FIO_setNotificationLevel(g_displayLevel);
     FIO_setAllowBlockDevices(prefs, allowBlockDevices);
     FIO_setPatchFromMode(prefs, patchFromDictFileName != NULL);
+    FIO_setMMapDict(prefs, mmapDict);
     if (memLimit == 0) {
         if (compressionParams.windowLog == 0) {
             memLimit = (U32)1 << g_defaultMaxWindowLog;