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Update README with better dd command

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Write /dev/urandom to memory first rather than directly to disk.
This means we aren't testing the speed of /dev/urandom, we're
testing the speed of the disk
This commit is contained in:
ducoterra
2021-01-16 21:46:52 -05:00
parent fa69a731a2
commit 6de774f9f3
1 changed files with 2 additions and 3 deletions
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README.md
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@@ -54,14 +54,13 @@ sys 0m0.000s
Test command: Test command:
```bash ```bash
dd if=/dev/urandom of=$DISK/output bs=1M count=1024; dd if=$DISK/output of=/dev/null; rm -f $DISK/output dd if=/dev/urandom of=/tmp/data bs=10M count=1024; dd if=/tmp/data of=$DISK/output; dd if=$DISK/output of=/dev/null; rm -f $DISK/output; rm -f /tmp/data
dd if=/dev/zero of=$DISK/output bs=1M count=1024; dd if=$DISK/output of=/dev/null; rm -f $DISK/output dd if=/dev/zero of=/tmp/data bs=10M count=1024; dd if=/tmp/data of=$DISK/output; dd if=$DISK/output of=/dev/null; rm -f $DISK/output; rm -f /tmp/data
``` ```
```bash ```bash
kubectl exec -it $(kubectl get pod --selector=app=monitor --output=jsonpath={.items..metadata.name}) -c disk -- bash kubectl exec -it $(kubectl get pod --selector=app=monitor --output=jsonpath={.items..metadata.name}) -c disk -- bash
export DISK=/tmp/hdd/ export DISK=/tmp/hdd/
export DISK=/tmp/usbssd/
export DISK=/tmp/nvme/ export DISK=/tmp/nvme/
``` ```