2024/07/08-15:12:01.151976 139819006674496 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00: fork to child time = 0.022269 sec 2024/07/08-15:12:01.152671 139819006674496 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00 2024/07/08-15:12:01.161551 139819006674496 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00 2024/07/08-15:12:01.163497 139819006674496 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/07/08-15:12:01.163822 139819006674496 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/07/08-15:12:01.225984 139819006674496 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-08T14.41.36/.rocksdb/job-02303/att-00/MANIFEST-12625661 2024/07/08-15:12:01.280109 139819006674496 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-08T14.41.36/.rocksdb/job-02303/att-00/MANIFEST-12625661 succeeded,manifest_file_number is 12625661, next_file_number is 12626973, last_sequence is 147210097919, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 12626714 2024/07/08-15:12:01.280119 139819006674496 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/07/08-15:12:01.280180 139819006674496 [version_set.cc:5652] Creating manifest 12626973 2024/07/08-15:12:01.307314 139819006674496 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00: bottommost_level: fake = 1, rpc = 0 2024/07/08-15:12:01.323709 139819006674496 [compaction_job.cc:2433] [default] [JOB 2303] Compacting 2@1 + 2@2 files to L2, score 0.96, subcompactions 1 : 1 2024/07/08-15:12:01.323723 139819006674496 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 1703 Base level 1, inputs: [12626947(17MB) 12626937(3509KB)], [12626824(49MB) 12626825(16MB)] 2024/07/08-15:12:01.543317 139819006674496 [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 2024/07/08-15:12:01.543345 139819006674496 [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 2024/07/08-15:12:01.543365 139819006674496 [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 2024/07/08-15:12:01.543377 139819006674496 [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 2024/07/08-15:12:01.543387 139819006674496 [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 2024/07/08-15:12:02.671471 139819006674496 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626974.sst) /dev/shm/ToplingTemp/Topling-13557-Ou354j 2024/07/08-15:12:02.985423 139819006674496 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626974.sst): first pass time = 0.31's, 213.795'MB/sec 2024/07/08-15:12:05.575066 139819006674496 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626974.sst): old prealloc_size = 73819750, real_size = 50988800 2024/07/08-15:12:05.575215 139819006674496 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626974.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 98877 prefix = 4 raw-key = 0.0012 GB zip-key = 0.0002 GB avg-key = 12.00 avg-zkey = 1.90 raw-val = 0.0647 GB zip-val = 0.0508 GB avg-val = 654.71 avg-zval = 513.53 2024/07/08-15:12:05.575388 139819006674496 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626974.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0002 GB, waited 0.000 sec, Key+Value = 0.067 GB 2024/07/08-15:12:05.795101 139819006674496 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626974.sst): second pass time = 2.59's, 25.009'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.22's, 236.087'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1545.627'MB/sec (index lex order gen) rebuild zvType time = 0.17's, 0.144'MB/sec write SST data time = 0.05's, 1069.270'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.672'MB, throughput = 15658.718'MB/sec zip my value time = 2.59's, unzip length = 0.065'GB zip my value throughput = 25.009'MB/sec zip pipeline throughput = 80.854'MB/sec entries = 98877 avg-key = 24.00 avg-zkey = 1.90 avg-val = 654.71 avg-zval = 513.53 usrkeys = 98877 avg-key = 16.00 avg-zkey = 1.90 avg-val = 661.71 avg-zval = 513.53 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 98877 bytes = 309008 } seq expand size = 692139 multi value expand size = 0 cnt WriteAppend = 16 UnZipSize{ index = 0.0016 GB value = 0.0647 GB dict = 0.67 MB all = 0.0671 GB } __ZipSize{ index = 0.0002 GB value = 0.0508 GB dict = 0.67 MB all = 0.0519 GB } UnZip/Zip{ index = 8.4222 value = 1.2749 dict = 1.00 all = 1.2919 } Zip/UnZip{ index = 0.1187 value = 0.7844 dict = 1.00 all = 0.7741 } ---------------------------- total value len = 0.065428 GB avg = 0.662 KB (by entry num) total key len = 0.002373 GB avg = 0.024 KB total ukey len = 0.001582 GB avg = 0.016 KB total ukey num = 0.000098877 Billion total entry num = 0.000098877 Billion write speed all = 0.003579462 MB/sec (with seq num) write speed all = 0.003537702 MB/sec (without seq num) 2024/07/08-15:12:05.860576 139819006674496 [compaction_job.cc:1944] [default] [JOB 2303] Generated table #12626974: 98877 keys, 51947528 bytes, temperature: kWarm 2024/07/08-15:12:05.860692 139819006674496 EVENT_LOG_v1 {"time_micros": 1720422725860620, "cf_name": "default", "job": 2303, "event": "table_file_creation", "file_number": 12626974, "file_size": 51947528, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 147192754622, "largest_seqno": 147210028644, "table_properties": {"data_size": 50776048, "index_size": 187840, "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": 2373048, "raw_average_key_size": 24, "raw_value_size": 64735954, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 98877, "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": 1720422722, "oldest_key_time": 0, "file_creation_time": 1720422722, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "465QC0QPK7Q93426EREI", "orig_file_number": 12626974, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/07/08-15:12:05.915432 139819006674496 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626975.sst) /dev/shm/ToplingTemp/Topling-13557-4Z1evj 2024/07/08-15:12:06.220822 139819006674496 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626975.sst): first pass time = 0.31's, 91.799'MB/sec 2024/07/08-15:12:08.117531 139819006674496 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626975.sst): old prealloc_size = 73819750, real_size = 21432288 2024/07/08-15:12:08.117634 139819006674496 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626975.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 41273 prefix = 4 raw-key = 0.0005 GB zip-key = 0.0001 GB avg-key = 12.00 avg-zkey = 2.42 raw-val = 0.0270 GB zip-val = 0.0213 GB avg-val = 655.13 avg-zval = 516.61 2024/07/08-15:12:08.117727 139819006674496 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626975.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0001 GB, waited 0.000 sec, Key+Value = 0.028 GB 2024/07/08-15:12:08.231997 139819006674496 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00/12626975.sst): second pass time = 1.90's, 14.264'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.11's, 190.642'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1362.818'MB/sec (index lex order gen) rebuild zvType time = 0.08's, 0.131'MB/sec write SST data time = 0.04's, 614.509'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.266'MB, throughput = 5765.680'MB/sec zip my value time = 1.90's, unzip length = 0.027'GB zip my value throughput = 14.264'MB/sec zip pipeline throughput = 156.872'MB/sec entries = 41273 avg-key = 24.00 avg-zkey = 2.42 avg-val = 655.13 avg-zval = 516.61 usrkeys = 41273 avg-key = 16.00 avg-zkey = 2.42 avg-val = 662.13 avg-zval = 516.61 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 41273 bytes = 128992 } seq expand size = 288911 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0007 GB value = 0.0270 GB dict = 0.27 MB all = 0.0280 GB } __ZipSize{ index = 0.0001 GB value = 0.0213 GB dict = 0.27 MB all = 0.0218 GB } UnZip/Zip{ index = 6.6185 value = 1.2681 dict = 1.00 all = 1.2847 } Zip/UnZip{ index = 0.1511 value = 0.7886 dict = 1.00 all = 0.7784 } ---------------------------- total value len = 0.092756 GB avg = 0.662 KB (by entry num) total key len = 0.003364 GB avg = 0.024 KB total ukey len = 0.002242 GB avg = 0.016 KB total ukey num = 0.000140150 Billion total entry num = 0.000140150 Billion write speed all = 0.005073856 MB/sec (with seq num) write speed all = 0.005014672 MB/sec (without seq num) 2024/07/08-15:12:08.271557 139819006674496 [compaction_job.cc:1944] [default] [JOB 2303] Generated table #12626975: 41273 keys, 21818928 bytes, temperature: kWarm 2024/07/08-15:12:08.271639 139819006674496 EVENT_LOG_v1 {"time_micros": 1720422728271598, "cf_name": "default", "job": 2303, "event": "table_file_creation", "file_number": 12626975, "file_size": 21818928, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 147192754560, "largest_seqno": 147210028324, "table_properties": {"data_size": 21322000, "index_size": 99776, "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": 990552, "raw_average_key_size": 24, "raw_value_size": 27039281, "raw_average_value_size": 655, "num_data_blocks": 1, "num_entries": 41273, "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": 1720422725, "oldest_key_time": 0, "file_creation_time": 1720422725, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "465QC0QPK7Q93426EREI", "orig_file_number": 12626975, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/07/08-15:12:08.285602 139819006674496 [compaction_job.cc:699] job-02303: subcompact[0], size: 0.073766 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-02303/att-00 [12626974,12626975] 2024/07/08-15:12:08.312635 139819006674496 (Original Log Time 2024/07/08-15:12:01.323767) EVENT_LOG_v1 {"time_micros": 1720422721323733, "job": 2303, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L1": [12626947, 12626937], "files_L2": [12626824, 12626825], "score": 0.959017, "input_data_size": 91279153, "oldest_snapshot_seqno": 147210097610} 2024/07/08-15:12:08.312640 139819006674496 (Original Log Time 2024/07/08-15:12:08.312099) [compaction_job.cc:2018] [default] [JOB 2303] Compacted 2@1 + 2@2 files to L2 => 73766456 bytes 2024/07/08-15:12:08.312643 139819006674496 (Original Log Time 2024/07/08-15:12:08.312547) [compaction_job.cc:1220] [default] compacted to: files[0 0 2 0 0 0 0] max score 0.03, MB/sec: 13.1 rd, 10.6 wr, level 2, files in(2, 2) out(2 +0 blob) MB in(20.7, 66.3 +0.0 blob) out(70.3 +0.0 blob), read-write-amplify(7.6) write-amplify(3.4) OK, records in: 163754, records dropped: 23604 output_compression: Snappy 2024/07/08-15:12:08.312652 139819006674496 (Original Log Time 2024/07/08-15:12:08.312604) EVENT_LOG_v1 {"time_micros": 1720422728312581, "cf": "default", "job": 2303, "event": "compaction_finished", "compaction_time_micros": 6961852, "compaction_time_cpu_micros": 613495, "output_level": 2, "num_output_files": 2, "total_output_size": 73766456, "num_input_records": 163754, "num_output_records": 140150, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 77036716, "file_range_sync_nanos": 0, "file_fsync_nanos": 1962, "file_prepare_write_nanos": 7611, "lsm_state": [0, 0, 2, 0, 0, 0, 0]} 2024/07/08-15:12:08.457553 139819006674496 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":1720420896,"starts":1720422721,"executesMs":7151,"compactionJobId":2303,"attempt":0,"compactionInputRawBytes":111165748,"compactionInputZipBytes":91279153,"compactionOutputRawBytes":0,"compactionOutputZipBytes":73766456,"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":"00-2f575b947860423d952b3032bf9fcc49-8184107803ca7f7a-00"}}, response = 2024/07/08-15:12:08.457661 139819006674496 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-08T14.41.36/.rocksdb/job-02303/att-00: olev 2, work 7.151 s, result 8.459 ms, install 0.589 ms, input{raw 106.016 MiB zip 87.051 MiB}