I/O Size and Sync Frequency
Optimize EFS performance based on I/O Size and Sync Frequency
This Lab will demonstrate how different I/O sizes and synchronization frequencies affect throughput to EFS.
- In the CLI, run the following command to write a 2GB file to EFS using a 1MB block size and sync once after each file. Record the time to complete.
time dd if=/dev/zero of=/efs/tutorial/dd/2G-dd-$(date +%Y%m%d%H%M%S.%3N) bs=1M count=2048 status=progress conv=fsync
- Run the following command to write 2 GB file to EFS using 16MB block size and sync once after each file. Record the time to complete.
time dd if=/dev/zero of=/efs/tutorial/dd/2G-dd-$(date +%Y%m%d%H%M%S.%3N) bs=16M count=128 status=progress conv=fsync
- Run the following command to write 2GB file to EFS using 1MB block size and sync after each block. Record the time to complete.
time dd if=/dev/zero of=/efs/tutorial/dd/2G-dd-$(date +%Y%m%d%H%M%S.%3N) bs=1M count=2048 status=progress oflag=sync
- Run the following command to write 2 GB file to EFS using 16MB block size and sync after each block. Record the time to complete.
time dd if=/dev/zero of=/efs/tutorial/dd/2G-dd-$(date +%Y%m%d%H%M%S.%3N) bs=16M count=128 status=progress oflag=sync
Synchronization after each block significantly reduces the performance of the file system. Optimal performance is achieved by synchronizing after each file.