Add blob compaction readahead size to the BlobDB benchmark script (#9566)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9566

Reviewed By: riversand963

Differential Revision: D34226256

Pulled By: ltamasi

fbshipit-source-id: 4374b819e937c35e3a866ba5b5eafba87ff20af3

tools/run_blob_bench.sh

@@ -53,6 +53,7 @@ function display_usage() {
   echo -e "\tENABLE_BLOB_GC\t\t\tEnable blob garbage collection (default: 1)"
   echo -e "\tBLOB_GC_AGE_CUTOFF\t\tBlob garbage collection age cutoff (default: 0.25)"
   echo -e "\tBLOB_GC_FORCE_THRESHOLD\t\tThreshold for forcing garbage collection of the oldest blob files (default: 1.0)"
+  echo -e "\tBLOB_COMPACTION_READAHEAD_SIZE\tBlob compaction readahead size (default: 0)"
   echo -e "\tTARGET_FILE_SIZE_BASE\t\tTarget SST file size for compactions (default: write buffer size, scaled down if blob files are enabled)"
   echo -e "\tMAX_BYTES_FOR_LEVEL_BASE\tMaximum size for the base level (default: 8 * target SST file size)"
 }
@@ -111,6 +112,7 @@ blob_compression_type=${BLOB_COMPRESSION_TYPE:-lz4}
 enable_blob_garbage_collection=${ENABLE_BLOB_GC:-1}
 blob_garbage_collection_age_cutoff=${BLOB_GC_AGE_CUTOFF:-0.25}
 blob_garbage_collection_force_threshold=${BLOB_GC_FORCE_THRESHOLD:-1.0}
+blob_compaction_readahead_size=${BLOB_COMPACTION_READAHEAD_SIZE:-0}
 
 if [ "$enable_blob_files" == "1" ]; then
   target_file_size_base=${TARGET_FILE_SIZE_BASE:-$((32 * write_buffer_size / value_size))}
@@ -139,6 +141,7 @@ echo -e "Compression type for blob files:\t$blob_compression_type"
 echo -e "Blob GC enabled:\t\t\t$enable_blob_garbage_collection"
 echo -e "Blob GC age cutoff:\t\t\t$blob_garbage_collection_age_cutoff"
 echo -e "Blob GC force threshold:\t\t$blob_garbage_collection_force_threshold"
+echo -e "Blob compaction readahead size:\t\t$blob_compaction_readahead_size"
 echo -e "Target SST file size:\t\t\t$target_file_size_base"
 echo -e "Maximum size of base level:\t\t$max_bytes_for_level_base"
 echo "================================================================="
@@ -171,7 +174,8 @@ PARAMS="\
 PARAMS_GC="$PARAMS \
   --enable_blob_garbage_collection=$enable_blob_garbage_collection \
   --blob_garbage_collection_age_cutoff=$blob_garbage_collection_age_cutoff \
-  --blob_garbage_collection_force_threshold=$blob_garbage_collection_force_threshold"
+  --blob_garbage_collection_force_threshold=$blob_garbage_collection_force_threshold \
+  --blob_compaction_readahead_size=$blob_compaction_readahead_size"
 
 # bulk load (using fillrandom) + compact
 env -u DURATION -S "$ENV_VARS" ./tools/benchmark.sh bulkload "$PARAMS"