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Hi - thanks for trying out our recent EFS+Lambda integration! EFS should be able to achieve a higher write speed to a large file for a test like this. It looks like the performance of downloading to /tmp and /mnt/files is comparable in both of your cases, so it seems like the download from S3 is the limiting factor. When you give your Lambda function 3 GB/s of memory does the performance improve? Similarly, when you write a file from /tmp to /mnt/files is the performance better? Both of these will help narrow down the bottleneck.
Thank you for the answers. They are in-line with what we are thinking and we are testing with lambda which is setup with 3008M byte RAM.
Any official AWS document clearly stated the speed of moving large file from S3 to either lambda /tmp or EFS access point? We have read some online experience where people saying it is 9-25Mbyte/sec but we would love to see some AWS document for that.
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