PATCH: Speed up htop

Hello.

A few days ago, I bought a Raspberry Pi. Those things don't exactly have much
computation power (700MHz ARM), but they're still quite nice. Well, when I ran
"htop", I was a bit disappointed about it using quite some CPU resources. I had
a look at the output of `strace` and saw that there was an anonymous mmap per
opened file (because of stdio) and that there were many invocations of
gettimeofday. Also, callgrind showed that quite some time was spent for parsing
scanf format strings.

I wrote a small patch that makes htop run faster (see the attachment). On my
Raspberry Pi, when filtering for "htop" and sorting by PID, htop with my patch
uses ~4-6% CPU while htop without my patch (from SVN) uses ~7-11% CPU – but
please measure yourself.

In some places, this makes the code a little bit bigger, but I think that the
increase in speed is worth it.

What do you think about this? Will you merge this patch?

Jann

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Enhancement request - color schemes

Maybe this has already been requested.. but here goes.

I downloaded the htop source package from the debian repository and took
a quick look at the code and it appears that I need to patch the code to
implement a color scheme that suits my requirements.

Would it be possible at some point in the future to make it possible to
change the color scheme via a configuration file, possibly with
256-color support for added flexibility?

Naturally, since htop uses the underlying terminal's colors, it's always
possible to modify them at execution time.. The problem with this
approach is that when you use a terminal multiplexer such as gnu/screen
or tmux, applications running in other windows are also affected.

Thanks,

CJ

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user color same as bacground color in black night

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Porting htop for Android

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Hide PF-keys help footer

I have been using htop daily for years and for mysterious reasons¹
I never got to take a look at the doc or even as much as hit F1 to bring
up the help screen..

Now, the _only_ thing that I never liked much about htop was that
I thought you had to use function keys to interact: bit of a pain with
laptops because function keys are usually undersized and that makes them
hard to reach². 

Couple of hours ago, I accidentally hit what turned out to be the 't'
key and much to my surprise, htop switched to the tree view. Uh-oh..
thought I.. what's going on. ? 

I tried the "H" key and bingo, up came the help screen.. and there it
was.. a nice reference card with all the convenient keyboard actions
that I never even suspected existed..

I can't say how embarrassed I felt.. and at the same time I must admit
that this lucky finding has made my day..!

Now here's the question: since where I am concerned that footer has
become irrelevant--it only mentions function keys, not the alternative
letter shortcuts--I'd rather get rid of it.

Is there any way I could do that with htop version 1.0.1-1..?

Thanks,

CJ

¹ Come to think of it, the reason may very well have been the on-screen
  help footer: Since it tells you to use function keys, I just tried
  them one after the other and was able to figure out how to use the
  different screens and features of htop without any problems. It just
  goes to show that when you are dealing with unimaginative people such
  as myself it may be best to tell them to just go "Read The Famous
  Manual" 

² Not to mention the fact that contrary to letters, PF keys are not
  mnemonic, hence harder to memorize..

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Request: adding dirty memory to memory meter

Hello,

What would you fellow htop users think about adding the amount of dirty
pages to the memory meter ? Also, I personally consider it much more
important than separating buffer from cache memory (these could simply
be merged into "cached" memory altogether).

What's your opinion on this ?

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Great prog, and a couple of questions

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Showing the memory column in a more human readable form.

Hi,

By default, the numbers in the memory column are shown in MBs only if
they are > 100,000 Bytes.

So, is there a way to show the numbers in the memory columns in a more
human readable form?  When I mean by human readable, I mean something
similar to the `-h` switch of `ls` -- starts at B, KB, then MB, GB etc.

If there isn't such a feature, would it be possible to implement one?
I'm using htop version 1.0.1 from the Ubuntu repositories.

Thanks a lot (for htop and otherwise)!

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[FEATURE REQUEST] allow -u option argument to be optional

Hi,

it occured to me that it would be very convinient to be able not to
pass argument to -u,--user. Not passing any argument would mean that
only processes of current a user should be shown. Please see attached
patch. Mind that it changes current behaviour of -u, 'htop -u foo' is
no longer valid in this case, it needs to be written as 'htop -ufoo'
or 'htop --user=foo', and of course 'htop -u' or 'htop --user' passes
current user implicitly.

BR, Bartek

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[ANN] htop 1.0.2

Hello,

I'm happy to announce htop 1.0.2!

https://sourceforge.net/projects/htop/

The major feature from this release is IO priority setting. You can
now press "i" and get the IO priority menu, where you can adjust the
IO scheduling class of your processes.
It also includes some fixes. Thanks to everyone who contributed bug
reports and patches. The ChangeLog follows in the end of this message.

Downloads, as usual, are available from the SourceForge project page:

https://sourceforge.net/projects/htop/files/htop/1.0.2/

Cheers!

-- Hisham
http://hisham.hm/

What's new in version 1.0.2

* Add IO priority support ('i' key)
* Avoid deleting .htoprc if it is a symlink
* Fail gracefully when /proc is not mounted
  (thanks to Philipp Hagemeister)
* Option to update process names on every refresh
  (thanks to Rob Hoelz)
* BUGFIX: Fix crashes when process list is empty

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Patch for htop: Refresh process names

Hi there!

I have another patch for htop!  htop currently does not update a
process' name if it changes (some scripts set their process name to
reflect their role or progress); this patch changes that.

Thanks,
Rob

diff --git a/ProcessList.c b/ProcessList.c
index bbb5cff..90f057a 100644
--- a/ProcessList.c
+++ b/ProcessList.c
 <at>  <at>  -701,12 +701,12  <at>  <at>  static bool ProcessList_processEntries(ProcessList* this, const char* dirname, P
          ProcessList_readVServerData(process, dirname, name);
          #endif

-         if (! ProcessList_readCmdlineFile(process, dirname, name))
-            goto errorReadingProcess;
-
          ProcessList_add(this, process);
       }

+     if (! ProcessList_readCmdlineFile(process, dirname, name))
+        goto errorReadingProcess;
+
       if (process->state == 'Z') {
          free(process->comm);
          process->comm = strdup(command);

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