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SixtyFour is a memory optimizer and system utility for 64-bit-capable hardware running Mac OS X 10.5 or higher.

SixtyFour presents a list of 64-bit apps that can open in 32-bit mode and facilitates the setting of a preference to force a listed app to open in 32-bit mode.

An app opened in 32-bit mode uses significantly less memory than when opened in 64-bit mode.

Running most if not all apps in 32-bit mode on systems that have little memory available could potentially lead to an increase in overall system performance.

What's New

Version 1.1.0:
  • Improved performance under Mac OS X 10.7 Lion or higher

Requirements

  • OS X 10.5 or later

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SixtyFour User Discussion

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Weasel Member IconReview+20
Weasel
+0

I recently had trouble with v 1.1.0 on my G5. It bounced in the dock & crashed. The developer found the problem & advised me on what to do. Problem gone!!!

Reply0 replies
Version 1.1.0
Weasel Member IconComment+20
Weasel
+0

I now have a G5 with a 64 bit dual processor. I tried to launch SixtyFour v1.1.0, it bounced in the dock then disappeared. I made a copy of the Problem Report to send the developer. Clicked on the 'contact us' on their home page but nothing happened. HELP!

Reply0 replies
Version 1.1.0
Mikael B Member IconComment+415
Mikael B
+1

If you need 32-bit kernel mode because of lack of driver support, as I did, then the sixtyfourswitcher preference panel is very simple to handle this and lock the Mac to 32bit:
http://www.macupdate.com/app/mac/32299/sixtyfourswitcher

Of course you can also just hold down "2" and "3" when booting too.

Otherwise SixtyFour may have its uses too. For some Macs it's simply not cost effective to upgrade RAM. I maxed out to 6gb on my old Macbook Pro and recently downgraded to SL because of stability issues. My machine does support ML so that is on the horizon when I have updated the well sounding hardware that needs 32bit kernel mode. :-)

Reply4 replies
Version 1.0.8
Mikael B
+0

Yes, that makes sense. SL is always booted in 32bit kernel mode, except AFAIK for in a few Xserves. That does of course not mean 64 bit apps must run in 32 bit even though the kernel is.

However, when running SixtyFour, I see only 250 of 519 apps listed and among those not listed are 64bit apps — and listed as such in System Info — that I'd like to try in 32bit to see if they can work. I have very few 64-bit apps that actually need much memory and that I keep open. Most listed are not in /Applications where I have only 140 applications installed currently. Why doesn't SixtyFour focus on the apps in there?

Mikael B
+0

OK, that makes some sense. Except that there's no reason what so ever to make changes to an app that isn't installed in Applications. Unnecessary work.

Consider that a request for SixtyFour to only list apps in /Applications.

Mikael B
+0

:-)

Another suggestion is to have clear instructions on how to evaluate the memory saved. At the moment I'm not sure what effect if any, SixtyFour have had on that.

A built-in full on memory analysis is perhaps a bit over the top, but I assume there are other apps that can do this job. I'm starting to look around.....

Mikael B
+0

I wasn't aware of Processtimer. Do you recommend to compare most favorably with application just opened or just some standard document loaded as well?

Thanks!

Imac4ever56 Member IconReview+0
Imac4ever56
+0

works great for me.

Reply0 replies
Version 1.0.8
Tom E. Gun Member IconComment+39
Tom E. Gun
+0

If you're such a smart developer, can you explain why do you compile your own app also as a ppc64 executable?
There is/was no PowerPC 64-bit capable mac ever!

Reply1 reply
Version 1.0.5
1951fdg (Developer)
+12

Power Mac G5.
http://www.apple.com/pr/library/2003/11/18Apple-Introduces-New-Dual-Processor-1-8-GHz-Power-Mac-G5.html

Espiridion Member IconComment+1147
Espiridion
+2

Although focused on working with audio, some people may find this interesting as it addressees many of the questions that have been posted regarding speed, memory usage, and performance.
http://www.meldaproduction.com/audiotutorials/32vs64.php

Reply1 reply
Version 1.0.4
1951fdg (Developer)
+0

Thanks for the link!

Penguirl Member IconComment+1057
Penguirl
+0

I guess there's nothing wrong with running 64 bit apps in 32 bit mode but if they don't have enough RAM that just means more pageins & pageouts which adds additional wear to your HDD or SSD. Better really to have enough RAM to meet your needs.

Reply6 replies
Version 1.0.4
Edgarcabrera
+0

Under Lion, Spotlight must be active in order to have App Store working fine and generally for the OS X, thus adding more pageins & pageouts... I would add a better memory managing under Lion as well, so the enough RAM will be really optimised... I was able to have around 60% of free RAM in 32 bits with 2Gb under normal conditions, now with Lion and 4Gb, I manage 38% of free RAM in 64 bit... therefore the memory managing in Lion is utterly horrible and more RAM will never be enough :(

Nick Collingridge
+3

@Edgarcabrera: Don't say that Lion is horrible at memory management unless you TRULY understand the deep-down details of what and how it is performing this function.

The amount of "Free" RAM is not necessarily that significant - much of the RAM marked as "Inactive" is not free simply because the system has not needed it. It is better to keep inactive program code and data in RAM than flush it to disk because it may be needed again (because of a context switch for example) before a program needs totally new RAM, and that way you avoid the delay involved in getting the code/data back into RAM from the hard disk as you would get if the OS maximally flushed stuff to disk in order to maximise the amount of "Free" RAM.

Edgarcabrera
+0

@Nick
After your explanation, the problem is that such caching should be always for the system itself, not for any non-system application... when you've got 4 applications cached, such cache or "inactive" memory is wasted, because in order to open another memory demanding application, such "inactive" memory must be freed, and a worst delay... and it is always better to have unoccupied memory. The memory management is horrible because it didn't happen in Tiger, in fact it should be as in the early days, load application to RAM, finish to use it and unload from RAM or if you've got to do caching, then do profiling on the applications... and by the way, the RAM initially was created to support the registers and to randomly put load and unload code...

Nick Collingridge
+1

In what way is it better to have that RAM empty or "Free" than to have it occupied by program code or data that might or probably will be re-used? Do you REALLY believe that it would be better for all of that stuff to be paged out than leaving it in RAM?

Edgarcabrera
+0

well, since what really happens is that the RAM is occupied by other applications and not liberated as intended for other applications, memory management is horrible... and there are long discussions in various forums in that respect, such an issue is becoming mythical... and do you REALLY want to have got such an issue?

Nick Collingridge
+1

OK, one simple question - what is the performance difference in an application getting RAM from "Free" memory rather than getting it from "Inactive" memory?

PorkPieHat Member IconComment+0
PorkPieHat
+2

Is it really pay-what-you-want-ware if you're broke and therefore want to pay $0.00 for it, but you must pay at least $0.01 and use a credit card or PayPal (which is also by credit card)?

Reply3 replies
Version 1.0.3
tmtsui
+4

If you are really broke, don't buy anything. Sell your computer, too.

GeoProf
+4

Actually, this developer's definition of pay-what-you-want-ware is anything OVER $1 USD - he won't accept 99 cents or less using either PayPal or a credit card. Isn't it amazing how easily we'll allow our language to be perverted in the name of capitalism?

1951fdg (Developer)
+3

PayPal charges a fee on the amount donated. Fees vary by country, please insure we receive at least $0,01 USD. If a payment is made from a US PayPal account, the PayPal fees are 3,9% + $0,30 USD. For example, for a donation of $1,00 USD, we receive $0,648 USD from PayPal.

tmtsui Member IconReview+12
tmtsui
+0

Memory is king. By forcing some apps into 32-bit mode does save me more RAM for running memory-hungry applications.

It's true that one can do the same by opening the info box of any app to find out whether it can be run in 32-bit mode. And then select the box to force the app to run in 32-bit. That's no doubt about it.

But this little app collects all the information and gives you a nice and user-friendly interface.

The new version even remembers which apps have been selected to run in 32-bit mode.

Just for that reason, I am willing to pay for it.

Moreover, I am impressed by the quick response from the developer regarding suggestions and questions.

Edgarcabrera. I did my payment via Paypal. I didn't find any problem with it.

Reply1 reply
Version 1.0.3
Bunky
+0

I will make a payment to register this handy little app..
Just recently ran into a situation using Graphic Converter. Was trying to open MrSid graphic files to convert parts of them to tiffs.
The LizardTech plug-in reported - unidentified files.. I emailed the developer (Lemke) and he replied - open GC in 32 bit mode and see what happens.. I suspect that there are numerous situations where this may be the case..???

Edgarcabrera Member IconReview+74
Edgarcabrera
+2

It's a very good little application, quite helpful to run those applications everyday use in 32bits mode in Lion, i.e. Safari, Mail, Webprocess, etc. to reduce memory usage. For more demanding applications, 64 bits is good.

But I'd like to recommend to the developer to have another payment gateway apart from Paypal, I've tried to pay for this but I can't via Paypal, perhaps google checkout?...

Reply6 replies
Version 1.0.3
tmtsui
+0

Hi Edgarcabrera, I overlooked at your comment regarding Paypal. Sorry about that.

Edgarcabrera
+0

it's alright, no worries

1951fdg (Developer)
+0

Why can't you pay via PayPal?

Edgarcabrera
+2

I'm using debit card, but it cannot be used it if issued from Mex, only CC but I don't have CC... I've got no issues with google checkout and App Store, but Paypal seems more restrictive...

1951fdg (Developer)
+0

I will sign up for Google Checkout. In the meantime, send an email to the email address displayed on the PayPal page.

Edgarcabrera
+0

Thank you, I appreciated it... I hope to have more payment options shall help you to get more customers, specially those who cannot pay via Paypal :)

user icon+0
DejanKumric4130
Version 1.1.0
user icon+0
Paolopavia
Version 1.1.0
user icon+0
bcx86
Version 1.0.6
> 5 8

Ratings

Overall
(8)
Current Version (1.x)
(8)

Details

Downloads 6,756
Version Downloads 641
License Demo
Date 01 Jan 2014
Platform Intel 64 / OS X / PPC 64
Price $2.99
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