2024/08/20-18:31:31.202134 140466085099072 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00: fork to child time = 0.023268 sec 2024/08/20-18:31:31.203113 140466085099072 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00 2024/08/20-18:31:31.209120 140466085099072 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00 2024/08/20-18:31:31.209622 140466085099072 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-18:31:31.210029 140466085099072 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-18:31:31.260347 140466085099072 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-44181/att-00/MANIFEST-14629260 2024/08/20-18:31:31.322409 140466085099072 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-44181/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14680118, last_sequence is 190903672587, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14680070 2024/08/20-18:31:31.322426 140466085099072 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-18:31:31.322532 140466085099072 [version_set.cc:5652] Creating manifest 14680118 2024/08/20-18:31:31.354190 140466085099072 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-18:31:31.373208 140466085099072 [compaction_job.cc:2433] [default] [JOB 44181] Compacting 1@2 + 2@3 files to L3, score 0.99, subcompactions 1 : 1 2024/08/20-18:31:31.373237 140466085099072 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 22493 Base level 2, inputs: [14680103(21MB)], [14680021(97MB) 14680116(52MB)] 2024/08/20-18:31:31.577432 140466085099072 [top_zip_table.cc:59] core git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-18:31:31.577458 140466085099072 [top_zip_table.cc:60] fsa git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-18:31:31.577481 140466085099072 [top_zip_table.cc:61] zbs git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-18:31:31.577496 140466085099072 [top_zip_table.cc:62] topling-zip_table_reader: git_version_hash_info_is: commit 7f80399bfbd2071b6e0f5683e8ab7225b8e6e394 Author: leipeng Date: 2024-01-19 14:52:30 +0800 Change ToplingZipTableOptions::sampleRatio to vector g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. cpu_flag: -march=native -mbmi -mbmi2 2024/08/20-18:31:31.577509 140466085099072 [top_zip_table.cc:64] topling-rocks git_version_hash_info_is: commit 1240987ca13d0fe562c9b9c037155079f0877840 Author: leipeng Date: 2024-01-19 15:07:04 +0800 Change ToplingZipTableOptions::sampleRatio to vector g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. cpu_flag: -march=native -mbmi -mbmi2 2024/08/20-18:31:32.413789 140466085099072 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680119.sst) /dev/shm/ToplingTemp/Topling-23404-JreEhW 2024/08/20-18:31:32.871276 140466085099072 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680119.sst): first pass time = 0.46's, 293.427'MB/sec 2024/08/20-18:31:38.776607 140466085099072 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680119.sst): old prealloc_size = 147639500, real_size = 100330800 2024/08/20-18:31:38.776809 140466085099072 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680119.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197718 prefix = 4 raw-key = 0.0024 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.88 raw-val = 0.1295 GB zip-val = 0.0999 GB avg-val = 654.84 avg-zval = 505.31 2024/08/20-18:31:38.777160 140466085099072 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680119.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-18:31:39.237509 140466085099072 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680119.sst): second pass time = 5.90's, 21.928'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.46's, 222.169'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2289.451'MB/sec (index lex order gen) rebuild zvType time = 0.33's, 0.149'MB/sec write SST data time = 0.13's, 800.471'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.351'MB, throughput = 30936.259'MB/sec zip my value time = 5.90's, unzip length = 0.129'GB zip my value throughput = 21.928'MB/sec zip pipeline throughput = 173.301'MB/sec entries = 197718 avg-key = 24.00 avg-zkey = 1.88 avg-val = 654.84 avg-zval = 505.31 usrkeys = 197718 avg-key = 16.00 avg-zkey = 1.88 avg-val = 661.84 avg-zval = 505.31 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197718 bytes = 766176 } seq expand size = 1384026 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0032 GB value = 0.1295 GB dict = 1.35 MB all = 0.1342 GB } __ZipSize{ index = 0.0004 GB value = 0.0999 GB dict = 1.35 MB all = 0.1024 GB } UnZip/Zip{ index = 8.4916 value = 1.2959 dict = 1.00 all = 1.3107 } Zip/UnZip{ index = 0.1178 value = 0.7717 dict = 1.00 all = 0.7629 } ---------------------------- total value len = 0.130857 GB avg = 0.662 KB (by entry num) total key len = 0.004745 GB avg = 0.024 KB total ukey len = 0.003163 GB avg = 0.016 KB total ukey num = 0.000197718 Billion total entry num = 0.000197718 Billion write speed all = 0.036917290 MB/sec (with seq num) write speed all = 0.036486664 MB/sec (without seq num) 2024/08/20-18:31:39.494529 140466085099072 [compaction_job.cc:1944] [default] [JOB 44181] Generated table #14680119: 197718 keys, 102401020 bytes, temperature: kWarm 2024/08/20-18:31:39.494701 140466085099072 EVENT_LOG_v1 {"time_micros": 1724149899494563, "cf_name": "default", "job": 44181, "event": "table_file_creation", "file_number": 14680119, "file_size": 102401020, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189648517461, "largest_seqno": 190903587493, "table_properties": {"data_size": 99908640, "index_size": 372544, "index_partitions": 0, "top_level_index_size": 0, "index_key_is_user_key": 0, "index_value_is_delta_encoded": 0, "filter_size": 0, "raw_key_size": 4745232, "raw_average_key_size": 24, "raw_value_size": 129472753, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 197718, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 24, "fixed_value_len": 18446744073709551615, "filter_policy": "", "column_family_name": "default", "column_family_id": 0, "comparator": "leveldb.BytewiseComparator", "merge_operator": "nullptr", "prefix_extractor_name": "nullptr", "property_collectors": "[Rdb_tbl_prop_coll_factory]", "compression": "FlatZip", "compression_options": "RS_Key0_Tag1-NestLoudsTrieDAWG_Mixed_XL_256_32_FL-DictZipBlobStore", "creation_time": 1724149892, "oldest_key_time": 0, "file_creation_time": 1724149892, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "90ZT1ZM5QNL093I8HHQG", "orig_file_number": 14680119, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-18:31:39.586120 140466085099072 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680120.sst) /dev/shm/ToplingTemp/Topling-23404-zw2VAV 2024/08/20-18:31:40.623730 140466085099072 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680120.sst): first pass time = 1.04's, 73.753'MB/sec 2024/08/20-18:31:42.016669 140466085099072 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680120.sst): old prealloc_size = 147639500, real_size = 57266016 2024/08/20-18:31:42.016813 140466085099072 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680120.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 112688 prefix = 4 raw-key = 0.0014 GB zip-key = 0.0002 GB avg-key = 12.00 avg-zkey = 1.90 raw-val = 0.0738 GB zip-val = 0.0570 GB avg-val = 655.07 avg-zval = 506.03 2024/08/20-18:31:42.016981 140466085099072 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680120.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0002 GB, waited 0.000 sec, Key+Value = 0.077 GB 2024/08/20-18:31:42.340414 140466085099072 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00/14680120.sst): second pass time = 1.39's, 53.067'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.32's, 180.556'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1888.236'MB/sec (index lex order gen) rebuild zvType time = 0.24's, 0.119'MB/sec write SST data time = 0.09's, 674.325'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.775'MB, throughput = 16242.416'MB/sec zip my value time = 1.39's, unzip length = 0.074'GB zip my value throughput = 53.067'MB/sec zip pipeline throughput = 71.343'MB/sec entries = 112688 avg-key = 24.00 avg-zkey = 1.90 avg-val = 655.07 avg-zval = 506.03 usrkeys = 112688 avg-key = 16.00 avg-zkey = 1.90 avg-val = 662.07 avg-zval = 506.03 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 112688 bytes = 436688 } seq expand size = 788816 multi value expand size = 0 cnt WriteAppend = 14 UnZipSize{ index = 0.0018 GB value = 0.0738 GB dict = 0.77 MB all = 0.0765 GB } __ZipSize{ index = 0.0002 GB value = 0.0570 GB dict = 0.77 MB all = 0.0585 GB } UnZip/Zip{ index = 8.4070 value = 1.2945 dict = 1.00 all = 1.3092 } Zip/UnZip{ index = 0.1189 value = 0.7725 dict = 1.00 all = 0.7638 } ---------------------------- total value len = 0.205464 GB avg = 0.662 KB (by entry num) total key len = 0.007450 GB avg = 0.024 KB total ukey len = 0.004966 GB avg = 0.016 KB total ukey num = 0.000310406 Billion total entry num = 0.000310406 Billion write speed all = 0.057916264 MB/sec (with seq num) write speed all = 0.057240777 MB/sec (without seq num) 2024/08/20-18:31:42.432849 140466085099072 [compaction_job.cc:1944] [default] [JOB 44181] Generated table #14680120: 112688 keys, 58451491 bytes, temperature: kWarm 2024/08/20-18:31:42.432936 140466085099072 EVENT_LOG_v1 {"time_micros": 1724149902432891, "cf_name": "default", "job": 44181, "event": "table_file_creation", "file_number": 14680120, "file_size": 58451491, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189814646578, "largest_seqno": 190903587593, "table_properties": {"data_size": 57023184, "index_size": 214464, "index_partitions": 0, "top_level_index_size": 0, "index_key_is_user_key": 0, "index_value_is_delta_encoded": 0, "filter_size": 0, "raw_key_size": 2704512, "raw_average_key_size": 24, "raw_value_size": 73818346, "raw_average_value_size": 655, "num_data_blocks": 1, "num_entries": 112688, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 24, "fixed_value_len": 18446744073709551615, "filter_policy": "", "column_family_name": "default", "column_family_id": 0, "comparator": "leveldb.BytewiseComparator", "merge_operator": "nullptr", "prefix_extractor_name": "nullptr", "property_collectors": "[Rdb_tbl_prop_coll_factory]", "compression": "FlatZip", "compression_options": "RS_Key0_Tag1-NestLoudsTrieDAWG_Mixed_XL_256_32_FL-DictZipBlobStore", "creation_time": 1724149899, "oldest_key_time": 0, "file_creation_time": 1724149899, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "90ZT1ZM5QNL093I8HHQG", "orig_file_number": 14680120, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-18:31:42.475625 140466085099072 [compaction_job.cc:699] job-44181: subcompact[0], size: 0.160853 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-44181/att-00 [14680119,14680120] 2024/08/20-18:31:42.537674 140466085099072 (Original Log Time 2024/08/20-18:31:31.373339) EVENT_LOG_v1 {"time_micros": 1724149891373263, "job": 44181, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14680103], "files_L3": [14680021, 14680116], "score": 0.994192, "input_data_size": 180421334, "oldest_snapshot_seqno": 190903672355} 2024/08/20-18:31:42.537679 140466085099072 (Original Log Time 2024/08/20-18:31:42.537108) [compaction_job.cc:2018] [default] [JOB 44181] Compacted 1@2 + 2@3 files to L3 => 160852511 bytes 2024/08/20-18:31:42.537682 140466085099072 (Original Log Time 2024/08/20-18:31:42.537556) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.01, MB/sec: 16.3 rd, 14.5 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(21.7, 150.4 +0.0 blob) out(153.4 +0.0 blob), read-write-amplify(15.0) write-amplify(7.1) OK, records in: 337464, records dropped: 27058 output_compression: Snappy 2024/08/20-18:31:42.537692 140466085099072 (Original Log Time 2024/08/20-18:31:42.537642) EVENT_LOG_v1 {"time_micros": 1724149902537615, "cf": "default", "job": 44181, "event": "compaction_finished", "compaction_time_micros": 11102302, "compaction_time_cpu_micros": 1237749, "output_level": 3, "num_output_files": 2, "total_output_size": 160852511, "num_input_records": 337464, "num_output_records": 310406, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 193044355, "file_range_sync_nanos": 0, "file_fsync_nanos": 2131, "file_prepare_write_nanos": 6985, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-18:31:42.687932 140466085099072 DEBG dcompact_worker.cpp:240: HttpPost: 200 OK: url = http://nlb-7zny4kaa1poal01o64.cn-shenzhen.nlb.aliyuncs.com:8443, body = {"instanceId":"nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137","labourId":"","dbId":"a007a635-5c0a-4b4a-be96-b9c695cb016b","dbStarts":1724092920,"starts":1724149891,"executesMs":11319,"compactionJobId":44181,"attempt":0,"compactionInputRawBytes":229103428,"compactionInputZipBytes":180421334,"compactionOutputRawBytes":0,"compactionOutputZipBytes":160852511,"headers":{"Accept":"*/*","Connection":"close","Host":"aliyun-topling-saas.topling.cn:18443","RemoteIp":"120.24.192.169","X-Forwarded-For":"120.24.192.169","region":"cn-shenzhen","token":"e6474c481bd4415abc537135cc03626b","instance-token":"e6474c481bd4415abc537135cc03626b","provider":"aliyun","CloudMarketInstanceId":"si-59c0ae5c955845588903","MeteringAssit":"","Transfer-Encoding":"chunked","traceparent":"00-521e4be05a2a9bfadd1e9eed196ee048-e1c30b36a5107ef6-00"}}, response = 2024/08/20-18:31:42.688053 140466085099072 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-44181/att-00: olev 3, work 11.319 s, result 15.460 ms, install 0.624 ms, input{raw 218.490 MiB zip 172.063 MiB}