2024/08/20-08:32:52.190726 140500397528640 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00: fork to child time = 0.057919 sec 2024/08/20-08:32:52.191817 140500397528640 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00 2024/08/20-08:32:52.197605 140500397528640 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00 2024/08/20-08:32:52.203913 140500397528640 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-08:32:52.204310 140500397528640 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-08:32:52.246401 140500397528640 [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-18835/att-00/MANIFEST-14629260 2024/08/20-08:32:52.260162 140500397528640 [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-18835/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14650738, last_sequence is 190263225132, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14650694 2024/08/20-08:32:52.260170 140500397528640 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-08:32:52.260232 140500397528640 [version_set.cc:5652] Creating manifest 14650738 2024/08/20-08:32:52.286040 140500397528640 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-08:32:52.301972 140500397528640 [compaction_job.cc:2433] [default] [JOB 18835] Compacting 1@2 + 2@3 files to L3, score 1.00, subcompactions 1 : 1 2024/08/20-08:32:52.301987 140500397528640 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 9673 Base level 2, inputs: [14650715(20MB)], [14650662(97MB) 14650663(50MB)] 2024/08/20-08:32:52.643872 140500397528640 [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 2024/08/20-08:32:52.643896 140500397528640 [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 2024/08/20-08:32:52.643914 140500397528640 [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 2024/08/20-08:32:52.643935 140500397528640 [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 2024/08/20-08:32:52.643949 140500397528640 [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 2024/08/20-08:32:53.641165 140500397528640 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650739.sst) /dev/shm/ToplingTemp/Topling-264163-xqnxAW 2024/08/20-08:32:54.127900 140500397528640 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650739.sst): first pass time = 0.49's, 275.790'MB/sec 2024/08/20-08:32:59.241222 140500397528640 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650739.sst): old prealloc_size = 147639500, real_size = 100375072 2024/08/20-08:32:59.241457 140500397528640 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650739.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197702 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 = 0.1000 GB avg-val = 654.89 avg-zval = 505.57 2024/08/20-08:32:59.241830 140500397528640 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650739.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-08:32:59.963543 140500397528640 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650739.sst): second pass time = 5.11's, 25.347'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.72's, 141.795'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1977.058'MB/sec (index lex order gen) rebuild zvType time = 0.61's, 0.081'MB/sec write SST data time = 0.11's, 892.504'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.352'MB, throughput = 25903.180'MB/sec zip my value time = 5.11's, unzip length = 0.129'GB zip my value throughput = 25.347'MB/sec zip pipeline throughput = 143.654'MB/sec entries = 197702 avg-key = 24.00 avg-zkey = 1.88 avg-val = 654.89 avg-zval = 505.57 usrkeys = 197702 avg-key = 16.00 avg-zkey = 1.88 avg-val = 661.89 avg-zval = 505.57 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197702 bytes = 741392 } seq expand size = 1383914 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 = 0.1000 GB dict = 1.35 MB all = 0.1024 GB } UnZip/Zip{ index = 8.4967 value = 1.2953 dict = 1.00 all = 1.3104 } Zip/UnZip{ index = 0.1177 value = 0.7720 dict = 1.00 all = 0.7631 } ---------------------------- 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 = 0.389531263 Billion total entry num = 0.346409271 Billion write speed all = 1.283327755 MB/sec (with seq num) write speed all = 1.231949598 MB/sec (without seq num) 2024/08/20-08:33:00.102569 140500397528640 [compaction_job.cc:1944] [default] [JOB 18835] Generated table #14650739: 197702 keys, 102421914 bytes, temperature: kWarm 2024/08/20-08:33:00.102672 140500397528640 EVENT_LOG_v1 {"time_micros": 1724113980102611, "cf_name": "default", "job": 18835, "event": "table_file_creation", "file_number": 14650739, "file_size": 102421914, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189647300645, "largest_seqno": 190263212970, "table_properties": {"data_size": 99953168, "index_size": 372288, "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": 4744848, "raw_average_key_size": 24, "raw_value_size": 129472946, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 197702, "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": 1724113973, "oldest_key_time": 0, "file_creation_time": 1724113973, "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": 14650739, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-08:33:00.200915 140500397528640 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650740.sst) /dev/shm/ToplingTemp/Topling-264163-m7IuOV 2024/08/20-08:33:00.955090 140500397528640 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650740.sst): first pass time = 0.75's, 98.201'MB/sec 2024/08/20-08:33:02.477310 140500397528640 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650740.sst): old prealloc_size = 147639500, real_size = 55506608 2024/08/20-08:33:02.477455 140500397528640 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650740.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 109091 prefix = 4 raw-key = 0.0013 GB zip-key = 0.0002 GB avg-key = 12.00 avg-zkey = 1.91 raw-val = 0.0714 GB zip-val = 0.0553 GB avg-val = 654.83 avg-zval = 506.65 2024/08/20-08:33:02.477622 140500397528640 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650740.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0002 GB, waited 0.000 sec, Key+Value = 0.074 GB 2024/08/20-08:33:02.826757 140500397528640 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00/14650740.sst): second pass time = 1.52's, 46.961'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.35's, 162.080'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1789.239'MB/sec (index lex order gen) rebuild zvType time = 0.29's, 0.094'MB/sec write SST data time = 0.06's, 952.785'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.745'MB, throughput = 17616.598'MB/sec zip my value time = 1.52's, unzip length = 0.071'GB zip my value throughput = 46.961'MB/sec zip pipeline throughput = 68.915'MB/sec entries = 109091 avg-key = 24.00 avg-zkey = 1.91 avg-val = 654.83 avg-zval = 506.65 usrkeys = 109091 avg-key = 16.00 avg-zkey = 1.91 avg-val = 661.83 avg-zval = 506.65 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 109091 bytes = 409104 } seq expand size = 763637 multi value expand size = 0 cnt WriteAppend = 17 UnZipSize{ index = 0.0017 GB value = 0.0714 GB dict = 0.74 MB all = 0.0741 GB } __ZipSize{ index = 0.0002 GB value = 0.0553 GB dict = 0.74 MB all = 0.0566 GB } UnZip/Zip{ index = 8.3968 value = 1.2925 dict = 1.00 all = 1.3076 } Zip/UnZip{ index = 0.1191 value = 0.7737 dict = 1.00 all = 0.7648 } ---------------------------- total value len = 62.499807 GB avg = 0.180 KB (by entry num) total key len = 6.796121 GB avg = 0.020 KB total ukey len = 3.194416 GB avg = 0.008 KB total ukey num = 0.389640354 Billion total entry num = 0.346518362 Billion write speed all = 1.284646659 MB/sec (with seq num) write speed all = 1.233255050 MB/sec (without seq num) 2024/08/20-08:33:02.898359 140500397528640 [compaction_job.cc:1944] [default] [JOB 18835] Generated table #14650740: 109091 keys, 56635268 bytes, temperature: kWarm 2024/08/20-08:33:02.898439 140500397528640 EVENT_LOG_v1 {"time_micros": 1724113982898393, "cf_name": "default", "job": 18835, "event": "table_file_creation", "file_number": 14650740, "file_size": 56635268, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189648517461, "largest_seqno": 190263213567, "table_properties": {"data_size": 55271264, "index_size": 207872, "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": 2618184, "raw_average_key_size": 24, "raw_value_size": 71436454, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 109091, "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": 1724113980, "oldest_key_time": 0, "file_creation_time": 1724113980, "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": 14650740, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-08:33:02.927031 140500397528640 [compaction_job.cc:699] job-18835: subcompact[0], size: 0.159057 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-18835/att-00 [14650739,14650740] 2024/08/20-08:33:02.982345 140500397528640 (Original Log Time 2024/08/20-08:32:52.302047) EVENT_LOG_v1 {"time_micros": 1724113972302000, "job": 18835, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14650715], "files_L3": [14650662, 14650663], "score": 0.996864, "input_data_size": 177401615, "oldest_snapshot_seqno": 190263224663} 2024/08/20-08:33:02.982351 140500397528640 (Original Log Time 2024/08/20-08:33:02.981644) [compaction_job.cc:2018] [default] [JOB 18835] Compacted 1@2 + 2@3 files to L3 => 159057182 bytes 2024/08/20-08:33:02.982354 140500397528640 (Original Log Time 2024/08/20-08:33:02.982191) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.01, MB/sec: 16.7 rd, 15.0 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(20.5, 148.7 +0.0 blob) out(151.7 +0.0 blob), read-write-amplify(15.6) write-amplify(7.4) OK, records in: 331982, records dropped: 25189 output_compression: Snappy 2024/08/20-08:33:02.982365 140500397528640 (Original Log Time 2024/08/20-08:33:02.982318) EVENT_LOG_v1 {"time_micros": 1724113982982224, "cf": "default", "job": 18835, "event": "compaction_finished", "compaction_time_micros": 10624996, "compaction_time_cpu_micros": 1312853, "output_level": 3, "num_output_files": 2, "total_output_size": 159057182, "num_input_records": 331982, "num_output_records": 306793, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 225470962, "file_range_sync_nanos": 0, "file_fsync_nanos": 1872, "file_prepare_write_nanos": 6143, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-08:33:03.127825 140500397528640 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":1724113972,"executesMs":10784,"compactionJobId":18835,"attempt":0,"compactionInputRawBytes":225372927,"compactionInputZipBytes":177401615,"compactionOutputRawBytes":0,"compactionOutputZipBytes":159057182,"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":"00-2612c9e4a8e5b981011c05eb0807cd93-d3059d7c2f11214c-00"}}, response = 2024/08/20-08:33:03.127957 140500397528640 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-18835/att-00: olev 3, work 10.784 s, result 6.342 ms, install 0.759 ms, input{raw 214.932 MiB zip 169.183 MiB}