Check These Out
Measure the cpu performance:
In-case if the cpu is thermal throttling then you can find it using this command.
Check the first line of the output.
Example:
Doing md5 for 3s on 16 size blocks: 11406892 md5's in 2.98s ? #(When cpu is not throttling)
Doing md5 for 3s on 16 size blocks: 110692 md5's in 2.98s ?? #(When cpu is thermal throttling)
Practical use case:
Once we had cooling outage in data center which caused thermal throttling in some of the worker nodes. We used this tool to prove that some servers are not performing well because of the cpu thermal throttling.
Benchmark a SQL query against MySQL Server.
The example runs the query 10 times, and you get the average runtime in the output. To ensure that the query does not get cached, use `RESET QUERY CACHE;` on top in the query file.
Adding course name prefix to lecture pdfs
Only shows files with actual changes to text (excluding whitespace). Useful if you've messed up permissions or transferred in files from windows or something like that, so that you can get a list of changed files, and clean up the rest.
If you need to xdebug a remote php application, which is behind a firewall, and you have an ssh daemon running on that machine. you can redirect port 9000 on that machine over to your local machine from which you run your xdebug client (I am using phpStorm)
So, run this command on your local machine and start your local xdebug client, to start debugging.
more info:
http://code.google.com/p/spectator/wiki/Installing
Using this command you can track a moment when usb device was attached.
Useful if you don't have at hand the ability to automatically create a booklet, but still want to.
F is the number of pages to print. It *must* be a multiple of 4; append extra blank pages if needed.
In evince, these are the steps to print it, adapted from https://help.gnome.org/users/evince/stable/duplex-npage.html.en :
1) Click File ▸ Print.
2) Choose the General tab.
Under Range, choose Pages.
Type the numbers of the pages in this order (this is what this one-liner does for you):
n, 1, 2, n-1, n-2, 3, 4, n-3, n-4, 5, 6, n-5, n-6, 7, 8, n-7, n-8, 9, 10, n-9, n-10, 11, 12, n-11...
...until you have typed n-number of pages.
3) Choose the Page Setup tab.
- Assuming a duplex printer:
Under Layout, in the Two-side menu, select Short Edge (Flip).
- If you can only print on one side, you have to print twice, one for the odd pages and one for the even pages.
In the Pages per side option, select 2.
In the Page ordering menu, select Left to right.
4) Click Print.
Takes all the .3gp files in the directory, rotates them by 90 degrees, and saves them in the lossless ffv1 encoding.
If this rotates in the wrong direction, you may want transponse=1
Re-encoding to ffv1 may result in a significant increase in file size, as it is a lossless format. Other applications may not recognize ffv1 if they don't use ffmpeg code. "huffyuv" might be another option for lossless saving of your transformations.
The audio may be re-encoded as well, if the encoding used by your 3gp file doesn't work in a avi container.
