All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: photography and
Thank you for purchasing through links and ads on this site.
diglloyd Deal Finder...
Buy other stuff at
Upgrade the memory of your 2018 Mac mini up to 64GB
Small Business Tax Write-Off?
Now is the time to purchase computer or photo gear for 2018 federal tax write-off. Consult with Lloyd.

diglloydTools v 2.2.15 Now Includes Java IntegrityChecker with up to 50% Speed Improvement

Need help deciding on a Mac? Lloyd offers one-on-one consulting on choosing the best Mac and its best configuration, backup protocol, displays, storage and RAID, etc.

Get diglloydTools and please consider subscribing to my photographic publications also.


diglloydTools works fine with macOS High Sierra—no known issues, and no update was needed.

diglloydTools was updated a week ago to include an optimization to IntegrityChecker.

Now diglloydTools 2.2.15 is updated to include an optimized version of icj, the Java version of IntegrityChecker, which runs on any platform that has a JVM (Mac, Windows, Linux, etc). As yet, the other tools remain native to macOS only.

Download page and release notes. Note: if downloaded before Dec 30 22:45 PST, download again; I found another improvement and added it. icj should be version 1.00.

Like the native version, the optimization in icj is simple: choosing the optimal number of hashing threads, which helps hugely on SSDs capable of 1.5 GB/sec and faster. The default number of hashing threads is now set to the number of virtual CPU cores. Also, the number and size of I/O buffers was found to have a huge impact; the number was decreased by 8X and the size quadrupled, which was found to work optimally on both HDD and SSD systems.

On slower devices there won’t be any speedup versus the native version, since the speed is limited by disk I/O. Due to algorithmic differences, icj can sometimes be faster than the native version, but it will consume more CPU cycles.

See also: diglloydTools IntegrityChecker Java Version: Finds Duplicates, Saved me 100GB!

Examples: speed on the 2017 iMac 5K

Shown below, the 2017 iMac 5K with its 3 GB/sec SSD can hit about 1644 MiB/sec = 1723 MB/sec if it has full CPU availability. The native-code version can do about 2400 MiB/sec = 2500 MB/sec. So the Java version is running at about 68% of the native version—extremely good.

If the drives are slower, the java and native versions will run about the same speed, though the native version will take fewer CPU cycles.

On an 8-core iMac Pro, speeds could double if the internal SSD is fast enough.

diglloydTools IntegrityChecker (java version) using all CPU cores
diglloydTools IntegrityChecker (java version) using all CPU cores

Some of the other capabilities in diglloydTools

Aside from testing hard drive or SSD or RAID performance and reliability with DiskTester, data integrity with IntegrityChecker is a must-have workflow tool for anyone with important data:

Deals Updated Daily at B&H Photo
View BEST Deals Right Now
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 5 hours unless noted. Certain deals may last longer.
$599 SAVE $200 = 25.0% Canon 17-40mm f/4 EF L USM in Lenses: DSLR
$520 SAVE $130 = 20.0% Canon 70-200mm f/4 EF L USM in Lenses: DSLR
$449 SAVE $100 = 18.0% DJI Goggles Racing Edition in Video: Drones
$299 SAVE $50 = 14.0% $149 FREE ITEMS DJI Spark Quadcopter (Sunrise Yellow) in Video: Drones
$50 SAVE $100 = 66.0% Lowepro DroneGuard CS 400 in Video: Drones
$2497 SAVE $300 = 10.0% $29 FREE ITEMS Nikon 70-200mm f/2.8 AF-S NIKKOR E FL ED VR in Lenses: DSLR
$898 SAVE $500 = 35.0% Sony a7 II Mirrorless in Cameras: Mirrorless
$898 SAVE $506 = 36.0% $19 FREE ITEMS Sony a7 II Mirrorless with Accessory Kit in Cameras: Mirrorless | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2008-2017 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__