Need a Sigma zoom profile--Sigma DG 50-500mm 4.5-6.3 APO

Does anyone have this lens profile: Sigma DG 50 - 500 mm 4.5 - 6.3 APO or can Adobe create this for me? I take photos of birds, and I use the following:
Canon 7D
My lenses are: Sigma DC 18 - 250 3.5-6.3 HSM---I have this lens in Camera Raw
However I cannot find the lens: Sigma DG 50 - 500 mm 4.5 -6.3 APO at all in Camera Raw for me to select.
I do not know how to create a profile, so would someone be kind enough to create one for me? I need it ASAP.
Thanks for your time.
98 cam

Here are the RAW-only lens profile files that ship with Lightroom 3.4 RC, where it looks like the Olympus is the camera-brand that doesn't have the 4.5-6.3 version of the lens:
03/08/2011 04:37 PM         1,443,084 Canon (SIGMA APO 50-500mm F4.5-6.3 DG OS HSM) - RAW.lcp
03/08/2011 04:37 PM           844,369 Canon (Sigma_50-500mm_F4-6.3_APO_EX_DG_HSM ) - RAW.lcp
03/08/2011 04:37 PM         1,460,076 NIKON CORPORATION (SIGMA APO 50-500mm F4.5-6.3 DG OS HSM) - RAW.lcp
03/08/2011 04:37 PM           607,951 NIKON CORPORATION (Sigma_50-500mm_F4-6.3_APO_EX_DG_HSM ) - RAW.lcp
03/08/2011 04:37 PM           846,553 OLYMPUS IMAGING CORP (Sigma_50-500mm_F4-6.3_APO_EX_DG_HSM ) - RAW.lcp
03/08/2011 04:37 PM         1,405,644 PENTAX (SIGMA APO 50-500mm F4.5-6.3 DG OS HSM) - RAW.lcp
03/08/2011 04:37 PM           822,529 PENTAX (Sigma_50-500mm_F4-6.3_APO_EX_DG_HSM ) - RAW.lcp
03/08/2011 04:37 PM         1,387,212 SIGMA (SIGMA APO 50-500mm F4.5-6.3 DG OS HSM) - RAW.lcp
03/08/2011 04:37 PM           811,777 SIGMA (Sigma_50-500mm_F4-6.3_APO_EX_DG_HSM ) - RAW.lcp
03/08/2011 04:37 PM         1,386,348 SONY (SIGMA APO 50-500mm F4.5-6.3 DG OS HSM) - RAW.lcp
03/08/2011 04:37 PM           811,273 SONY (Sigma_50-500mm_F4-6.3_APO_EX_DG_HSM ) - RAW.lcp

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great explanation! Thanks
"ihse" <[email protected]> wrote in message
news:18555807.1105611467160.JavaMail.root@jserv5...
About thin, fat, recursive and contended locks in JRockit:
Let's start with the easiest part: recursive locks. A recursive lock
occurs in the following scenario:synchronized(foo) { // first time thread takes lock
synchronized(foo) { // this time, the lock is taken recursively
}The recursive lock taking may also occur in a method call several levels
down - it doesn't matter. Recursive locks are not neccessarily any sign of
bad programming, at least not if the recursive lock taking is done by a
separate method.
The good news is that recursive lock taking in JRockit is extremely fast.
In fact, the cost to take a lock recursively is almost negligable. This is
regardless if the lock was originally taken as a thin or a fat lock
(explained in detail below).
Now let's talk a bit about contention. Contention occurs whenever a thread
tries to take a lock, and that lock is not available (that is, it is held
by another thread). Let me be clear: contention ALWAYS costs in terms of
performance. The exact cost depends on many factors. I'll get to some more
details on the costs later on.
So if performance is an issue, you should strive to avoid contention.
Unfortunately, in many cases it is not possible to avoid contention -- if
you're application requires several threads to access a single, shared
resource at the same time, contention is unavoidable. Some designs are
better than others, though. Be careful that you don't overuse
synchronized-blocks. Minimize the code that has to be run while holding a
highly-contended lock. Don't use a single lock to protect unrelated
resources, if that lock proves to be easily contended.
In principle, that is all you can do as an application developer: design
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flags to change some of the JRockit locking behaviour, but I strongly
discourage anyone from using these. The default values is carefully
trimmed, and changing this is likely to result in worse, rather than
better, performance.
Still, I understand if you're curious to what JRockit is doing with your
application. I'll give some more details about the locking strategies in
JRockit.
All objects in Java are potential locks (monitors). This potential is
realized as an actual lock as soon as any thread enters a synchronized
block on that object. When a lock is "born" in this way, it is a kind of
lock that is known as a "thin lock". A thin lock has the following
characteristics:
* It requires no extra memory -- all information about the lock is stored
in the object itself.
* It is fast to take.
* Other threads that try to take the lock cannot register themselves as
contending.
The most costly part of taking a thin lock is a CAS (compare-and-swap)
operation. It's an atomic instruction, which means as far as CPU
instructions goes, it is dead slow. Compared to other parts of locking
(contention in general, and taking fat locks in specific), it is still
very fast.
For locks that are mostly uncontended, thin locks are great. There is
little overhead compared to no locking, which is good since a lot of Java
code (especially in the class library) use lot of synchronization.
However, as soon as a lock becomes contended, the situation is not longer
as obvious as to what is most efficient. If a lock is held for just a very
short moment of time, and JRockit is running on a multi-CPU (SMP) machine,
the best strategy is to "spin-lock". This means, that the thread that
wants the lock continuously checks if the lock is still taken, "spinning"
in a tight loop. This of course means some performance loss: no actual
user code is running, and the CPU is "wasting" time that could have been
spent on other threads. Still, if the lock is released by the other
threads after just a few cycles in the spin loop, this method is
preferable. This is what's meant by a "contended thin lock".
If the lock is not going to be released very fast, using this method on
contention would lead to bad performance. In that case, the lock is
"inflated" to a "fat lock". A fat lock has the following characteristics:
* It requeries a little extra memory, in terms of a separate list of
threads wanting to acquire the lock.
* It is relatively slow to take.
* One (or more) threads can register as queueing for (blocking on) that
lock.
A thread that encounters contention on a fat lock register itself as
blocking on that lock, and goes to sleep. This means giving up the rest of
its time quantum given to it by the OS. While this means that the CPU will
be used for running real user code on another thread, the extra context
switch is still expensive, compared to spin locking. When a thread does
this, we have a "contended fat lock".
When the last contending thread releases a fat lock, the lock normally
remains fat. Taking a fat lock, even without contention, is more expensive
than taking a fat lock (but less expensive than converting a thin lock to
a fat lock). If JRockit believes that the lock would benefit from being
thin (basically, if the contention was pure "bad luck" and the lock
normally is uncontended), it might "deflate" it to a thin lock again.
A special note regarding locks: if wait/notify/notifyAll is called on a
lock, it will automatically inflate to a fat lock. A good advice (not only
for this reason) is therefore not to mix "actual" locking with this kind
of notification on a single object.
JRockit uses a complex set of heuristics to determine amongst other
things:
* When to spin-lock on a thin lock (and how long), and when to inflate it
to a fat lock on contention.
* If and when to deflate a fat lock back to a thin lock.
* If and when to skip on the fairness on a contended fat lock to improve
performance.
These heuristics are dynamically adaptive, which means that they will
automatically change to what's best suited for the actual application that
is being run.
Since the switch beteen thin and fat locks are done automatically by
JRockit to the kind of lock that maximizes performance of the application,
the relative difference in performance between thin and fat locks
shouldn't really be of any concern to the user. It is impossible to give a
general answer to this question anyhow, since it differs from system to
system, depending on how many CPU:s you have, what kind of CPU:s, the
performance on other parts of the system (memory, cache, etc) and similar
factors. In addition to this, it is also very hard to give a good answer
to the question even for a specific system. Especially tricky is it to
determine with any accuracy the time spent spinning on contended thin
locks, since JRockit loops just a few machine instuctions a few times
before giving up, and profiling of this is likely to heavily influence the
time, giving a skewed image of the performance.
To summarize:
If you're concerned about performance, and can change your program to
avoid contention on a lock - then do so. If you can't avoid contention,
try to keep the code needed to run contended to a minimum. JRockit will
then do whatever is in its power to run your progam as fast as possible.
Use the lock information provided by JRA as a hint: fat locks are likely
to have been contended much or for a long time. Put your effort on
minimizing contention on them.

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