Tests were run on a EPYC 7401p server with 128GB RAM and a SAMSUNG MZQLB1T9HAJR-00007 NVMe running CentOS 7. Data partition used was formatted as ext4 (journaling disabled). Server process was limited to one cpu (via docker's --cpuset-cpus option). Host networking was used on server's docker container. Clients were bound to a specific cpu running on the host via pthread_setaffinity_np(). CLOCK_MONOTONIC was used for measurements. Updating was done from one process while fetching was done from two.
System info/modified params:
[root@xx ~]# uname -a
Linux xx 5.2.11-1.el7.elrepo.x86_64 #1 SMP Thu Aug 29 08:10:52 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux
[root@xx ~]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-5.2.11-1.el7.elrepo.x86_64 root=xx ro biosdevname=0 crashkernel=auto nomodeset rd.auto=1 consoleblank=0 mem=5G
[root@xx ~]# cat /proc/sys/vm/zone_reclaim_mode
0
[root@xx ~]# cat /sys/block/nvme0n1/queue/read_ahead_kb
0
[root@xx hrvoje]# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
Dependencies:
- fmt - https://github.com/fmtlib/fmt
- tdigest - https://github.com/ajwerner/tdigestc
- mongo-c-driver - https://github.com/mongodb/mongo-c-driver
Test compiles with:
[root@devel ~]# clang++ -o mongo.o -c -std=c++17 -fPIC -Wall -O3 -fomit-frame-pointer -I. -I/usr/include/libbson-1.0 -I/usr/include/libmongoc-1.0 mongo.cpp
Command:
[root@xx /]# mongod --config /data/mongod.conf
Results:
Dependencies:
- fmt - https://github.com/fmtlib/fmt
- tdigest - https://github.com/ajwerner/tdigestc
- datastax cpp driver
Test compiles with:
[root@devel ~]# clang++ -o scylla.o -c -std=c++17 -fPIC -Wall -O3 -fomit-frame-pointer -I. scylla.cpp
Command:
[root@xx /]# scylla --options-file /data/scylla.yaml -c 1 --cpuset 1 --num-io-queues 1 --max-io-requests 32
Results:
Results:
