Date: Fri, 9 Nov 2012 14:37:46 +0100 From: Achim Patzner <ap@bnc.net> To: David <turbolad995@yahoo.co.uk> Cc: freebsd-performance@freebsd.org Subject: Re: Compressed RAM disk swap space Message-ID: <C9896033-7D0B-47AB-9202-E29378A0D64D@bnc.net> In-Reply-To: <509CF81F.7090803@yahoo.co.uk> References: <509CF81F.7090803@yahoo.co.uk>
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Am 09.11.2012 um 13:33 schrieb David <turbolad995@yahoo.co.uk>: > Hi, I have tried something which actually boosts performance It doesn't; it just moves the load from one limited resource (RAM) to another one (CPU cycles), adding its own overhead on the way. It just means that your machine got too large an engine for your tires. Save on CPU power and get more RAM next time. > : a compressed RAM disk used as swap space. It nearly sounds as good as "hey, we've got virtual memory, let's generate an incredibly large RAM disk". To me it sounds like investing into sovereign debt of your home country and paying your interest rate with your own increased taxes. Why swap into RAM if your process could use it as well? About the cost of compression: This idea was already annoying decades ago (doesn't anyone remember those "RAM extenders" for MS-DOS that gave you "more RAM than your computer contains"?) when software suddenly got inexplicably slow (until you found the driver chewing on its own tail by trying to decompress itself) and was one of the reasons I moved to SCO and BSD/386. Achimhelp
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