2024/08/20-12:09:39.351798 140500229674560 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00: fork to child time = 0.016998 sec 2024/08/20-12:09:39.353378 140500229674560 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00 2024/08/20-12:09:39.373666 140500229674560 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00 2024/08/20-12:09:39.374015 140500229674560 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-12:09:39.374369 140500229674560 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-12:09:39.479027 140500229674560 [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-28536/att-00/MANIFEST-14629260 2024/08/20-12:09:39.528629 140500229674560 [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-28536/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14661958, last_sequence is 190511598074, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14661905 2024/08/20-12:09:39.528645 140500229674560 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-12:09:39.528752 140500229674560 [version_set.cc:5652] Creating manifest 14661958 2024/08/20-12:09:39.554378 140500229674560 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-12:09:39.570050 140500229674560 [compaction_job.cc:2433] [default] [JOB 28536] Compacting 1@2 + 2@3 files to L3, score 0.97, subcompactions 1 : 1 2024/08/20-12:09:39.570069 140500229674560 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 14576 Base level 2, inputs: [14661925(31MB)], [14661895(97MB) 14661946(26MB)] 2024/08/20-12:09:39.886335 140500229674560 [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 2024/08/20-12:09:39.886371 140500229674560 [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 2024/08/20-12:09:39.886400 140500229674560 [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 2024/08/20-12:09:39.886416 140500229674560 [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 2024/08/20-12:09:39.886431 140500229674560 [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 2024/08/20-12:09:40.574254 140500229674560 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661959.sst) /dev/shm/ToplingTemp/Topling-339310-ECwdUe 2024/08/20-12:09:41.073362 140500229674560 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661959.sst): first pass time = 0.50's, 268.948'MB/sec 2024/08/20-12:09:44.452110 140500229674560 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661959.sst): old prealloc_size = 147639500, real_size = 100255296 2024/08/20-12:09:44.452335 140500229674560 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661959.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197711 prefix = 4 raw-key = 0.0024 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.91 raw-val = 0.1295 GB zip-val = 0.0998 GB avg-val = 654.86 avg-zval = 504.92 2024/08/20-12:09:44.452621 140500229674560 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661959.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-12:09:45.037468 140500229674560 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661959.sst): second pass time = 3.38's, 38.346'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.59's, 174.767'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1918.280'MB/sec (index lex order gen) rebuild zvType time = 0.48's, 0.102'MB/sec write SST data time = 0.10's, 1001.234'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 = 22567.562'MB/sec zip my value time = 3.38's, unzip length = 0.129'GB zip my value throughput = 38.346'MB/sec zip pipeline throughput = 78.253'MB/sec entries = 197711 avg-key = 24.00 avg-zkey = 1.91 avg-val = 654.86 avg-zval = 504.92 usrkeys = 197711 avg-key = 16.00 avg-zkey = 1.91 avg-val = 661.86 avg-zval = 504.92 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197711 bytes = 741424 } seq expand size = 1383977 multi value expand size = 0 cnt WriteAppend = 14 UnZipSize{ index = 0.0032 GB value = 0.1295 GB dict = 1.35 MB all = 0.1342 GB } __ZipSize{ index = 0.0004 GB value = 0.0998 GB dict = 1.35 MB all = 0.1023 GB } UnZip/Zip{ index = 8.3932 value = 1.2969 dict = 1.00 all = 1.3120 } Zip/UnZip{ index = 0.1191 value = 0.7710 dict = 1.00 all = 0.7622 } ---------------------------- total value len = 62.427607 GB avg = 0.180 KB (by entry num) total key len = 6.793503 GB avg = 0.020 KB total ukey len = 3.192671 GB avg = 0.008 KB total ukey num = 0.389531272 Billion total entry num = 0.346409280 Billion write speed all = 1.034017684 MB/sec (with seq num) write speed all = 0.992620680 MB/sec (without seq num) 2024/08/20-12:09:45.158297 140500229674560 [compaction_job.cc:1944] [default] [JOB 28536] Generated table #14661959: 197711 keys, 102301505 bytes, temperature: kWarm 2024/08/20-12:09:45.158418 140500229674560 EVENT_LOG_v1 {"time_micros": 1724126985158333, "cf_name": "default", "job": 28536, "event": "table_file_creation", "file_number": 14661959, "file_size": 102301505, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189648517461, "largest_seqno": 190511460174, "table_properties": {"data_size": 99828784, "index_size": 376896, "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": 4745064, "raw_average_key_size": 24, "raw_value_size": 129472759, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 197711, "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": 1724126980, "oldest_key_time": 0, "file_creation_time": 1724126980, "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": 14661959, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-12:09:45.224015 140500229674560 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661960.sst) /dev/shm/ToplingTemp/Topling-339310-sF5wvf 2024/08/20-12:09:45.624164 140500229674560 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661960.sst): first pass time = 0.40's, 109.794'MB/sec 2024/08/20-12:09:46.824582 140500229674560 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661960.sst): old prealloc_size = 147639500, real_size = 33028928 2024/08/20-12:09:46.824680 140500229674560 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661960.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 64697 prefix = 4 raw-key = 0.0008 GB zip-key = 0.0001 GB avg-key = 12.00 avg-zkey = 1.96 raw-val = 0.0424 GB zip-val = 0.0329 GB avg-val = 654.98 avg-zval = 508.30 2024/08/20-12:09:46.824776 140500229674560 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661960.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0001 GB, waited 0.000 sec, Key+Value = 0.044 GB 2024/08/20-12:09:46.937604 140500229674560 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00/14661960.sst): second pass time = 1.20's, 35.354'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.11's, 297.855'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1692.599'MB/sec (index lex order gen) rebuild zvType time = 0.09's, 0.183'MB/sec write SST data time = 0.02's, 1368.571'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.431'MB, throughput = 10678.504'MB/sec zip my value time = 1.20's, unzip length = 0.042'GB zip my value throughput = 35.354'MB/sec zip pipeline throughput = 71.108'MB/sec entries = 64697 avg-key = 24.00 avg-zkey = 1.96 avg-val = 654.98 avg-zval = 508.30 usrkeys = 64697 avg-key = 16.00 avg-zkey = 1.96 avg-val = 661.98 avg-zval = 508.30 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 64697 bytes = 218368 } seq expand size = 452879 multi value expand size = 0 cnt WriteAppend = 22 UnZipSize{ index = 0.0010 GB value = 0.0424 GB dict = 0.43 MB all = 0.0439 GB } __ZipSize{ index = 0.0001 GB value = 0.0329 GB dict = 0.43 MB all = 0.0337 GB } UnZip/Zip{ index = 8.1441 value = 1.2886 dict = 1.00 all = 1.3049 } Zip/UnZip{ index = 0.1228 value = 0.7761 dict = 1.00 all = 0.7663 } ---------------------------- total value len = 62.470435 GB avg = 0.180 KB (by entry num) total key len = 6.795055 GB avg = 0.020 KB total ukey len = 3.193706 GB avg = 0.008 KB total ukey num = 0.389595969 Billion total entry num = 0.346473977 Billion write speed all = 1.034651274 MB/sec (with seq num) write speed all = 0.993247713 MB/sec (without seq num) 2024/08/20-12:09:47.001216 140500229674560 [compaction_job.cc:1944] [default] [JOB 28536] Generated table #14661960: 64697 keys, 33663567 bytes, temperature: kWarm 2024/08/20-12:09:47.001277 140500229674560 EVENT_LOG_v1 {"time_micros": 1724126987001244, "cf_name": "default", "job": 28536, "event": "table_file_creation", "file_number": 14661960, "file_size": 33663567, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190397636627, "largest_seqno": 190511460305, "table_properties": {"data_size": 32885488, "index_size": 127104, "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": 1552728, "raw_average_key_size": 24, "raw_value_size": 42375282, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 64697, "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": 1724126985, "oldest_key_time": 0, "file_creation_time": 1724126985, "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": 14661960, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-12:09:47.021550 140500229674560 [compaction_job.cc:699] job-28536: subcompact[0], size: 0.135965 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-28536/att-00 [14661959,14661960] 2024/08/20-12:09:47.049033 140500229674560 (Original Log Time 2024/08/20-12:09:39.570159) EVENT_LOG_v1 {"time_micros": 1724126979570085, "job": 28536, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14661925], "files_L3": [14661895, 14661946], "score": 0.965515, "input_data_size": 164079980, "oldest_snapshot_seqno": 190511597552} 2024/08/20-12:09:47.049037 140500229674560 (Original Log Time 2024/08/20-12:09:47.048630) [compaction_job.cc:2018] [default] [JOB 28536] Compacted 1@2 + 2@3 files to L3 => 135965072 bytes 2024/08/20-12:09:47.049038 140500229674560 (Original Log Time 2024/08/20-12:09:47.048968) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.01, MB/sec: 22.0 rd, 18.2 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(32.0, 124.5 +0.0 blob) out(129.7 +0.0 blob), read-write-amplify(9.0) write-amplify(4.1) OK, records in: 300835, records dropped: 38427 output_compression: Snappy 2024/08/20-12:09:47.049045 140500229674560 (Original Log Time 2024/08/20-12:09:47.049012) EVENT_LOG_v1 {"time_micros": 1724126987048993, "cf": "default", "job": 28536, "event": "compaction_finished", "compaction_time_micros": 7451399, "compaction_time_cpu_micros": 1164142, "output_level": 3, "num_output_files": 2, "total_output_size": 135965072, "num_input_records": 300835, "num_output_records": 262408, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 118025107, "file_range_sync_nanos": 0, "file_fsync_nanos": 1718, "file_prepare_write_nanos": 6403, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-12:09:47.172794 140500229674560 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":1724126979,"executesMs":7691,"compactionJobId":28536,"attempt":0,"compactionInputRawBytes":204246189,"compactionInputZipBytes":164079980,"compactionOutputRawBytes":0,"compactionOutputZipBytes":135965072,"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":"00-1a7814f8cd47841a40fb043b58576426-ae93294da0e6c06f-00"}}, response = 2024/08/20-12:09:47.172900 140500229674560 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-28536/att-00: olev 3, work 7.692 s, result 4.734 ms, install 0.439 ms, input{raw 194.784 MiB zip 156.479 MiB}