> -----Original Message-----
> From: David Teran [SMTP:[EMAIL PROTECTED]]
> Sent: Friday, April 12, 2002 0:32
> To: [EMAIL PROTECTED]
> Subject: [iText-questions] optimizing formatDouble and append in
> ByteBuffer
>
> Hi,
>
> i played around with the profiling infos from the JVM and it turnes out
> that formatDouble creates a lot of temporary byte[] and char[] and
> String and StringBuffer's. I already implemented a simple cache and the
> overall speed of a 23 page report is 10% better, memory usage without
> garbage collection is 40% less. Is anyone else trying to optimize speed
> and memory footprint of itext currently?
>
formatDouble already had an improvement but more sugestions are
welcomed.
I thought of having a formatDouble(int) but most of the numbers are
float, anyway.
> The simple cache just caches all converted numbers from -32768 to 32768
> and returns the cached bytes instead of recalculating them with
> getISOBytes again.
>
Probably a cache from -100 to 1000 will cover 99.9% of the cases.
getISOBytes can also be improved by casting the char directly to
byte.
> I will also implement a cache for ascii based String with a length <=2,
> this should also increase performance and reduce memory usage because
> getISOBytes shouldnt get called in this either.
>
Searching the cache also takes time. I don't know if getISOBytes
with direct cast wouldn't be as fast. Of course, there's a new byte[] that
must be accounted for. Only profiling will tell.
Best Regards,
Paulo Soares
> regards, david
>
>
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