[Solved] Are MY speed disk results correct

[thedman]

Hi all,

I've built my hackint0sh and love it, thanks to all the people that have contributed to the forums, you've helped me loads.

I have the i5 build, exactly as described in the customac section.

I have a 60Gb Corsair Force 3 for my apps and to boot from. My speed disk results are as follows:

Write approx 80 MB/s and Read approx 200 MB/s

The SSD is plugged in to the white data port marked SATA3_0

My seagate rotational drive writes at 100 MB/s and reads at 100 MB/s.

Surely something is wrong here...

Thanks in advance,

Dave.

 

[SteinVS]

Re: Are MY speed disk results correct

What did you use to test write speeds? Things like Blackmagic disk speed (from the app store) don't bench ssd well because of the differences between the way data is written on standard HD's and ssd's. To get your an accurate write speed try this...

In the terminal:

time mkfile 4g /test

time cp -p /test /test.2

The first command will generate a 4gb file called test... estimate write speed.
The second will copy that file... read speed.

I used Blackmagic disk speed and got about 80.3 mb/sec write, far below expected
This terminal test shows:

command 1 results:
real 0m16.137s
user 0m0.580s
sys 0m13.067s

So, 4096/16.137 = ~254 mb/sec

command 2 results:
real 0m19.060s
user 0m0.003s
sys 0m2.023s

And, 4096/19.060 = ~215 mb/sec

 

[thedman]

Re: Are MY speed disk results correct

Aaah!

Thanks for that, following your instructions I get:

write speed = 302.7
read speed = 439.5

Thanks a million,

Dave.

 

[SteinVS]

Re: Are MY speed disk results correct

Good to hear it all worked! Lets chalk it up to solved then... Might as well update the thread title while you're at it

Cheers

 

[patterson0608]

Re: Are MY speed disk results correct

What did you use to test write speeds? Things like Blackmagic disk speed (from the app store) don't bench ssd well because of the differences between the way data is written on standard HD's and ssd's. To get your an accurate write speed try this...

In the terminal:

time mkfile 4g /test

time cp -p /test /test.2

The first command will generate a 4gb file called test... estimate write speed.
The second will copy that file... read speed.

I used Blackmagic disk speed and got about 80.3 mb/sec write, far below expected
This terminal test shows:

command 1 results:
real 0m16.137s
user 0m0.580s
sys 0m13.067s

So, 4096/16.137 = ~254 mb/sec

command 2 results:
real 0m19.060s
user 0m0.003s
sys 0m2.023s

And, 4096/19.060 = ~215 mb/sec

Any idea why I'd be getting a "permission denied" error when I try the first command at a terminal prompt? My system group under "sharing and permissions" is set to "everyone."

Thanks!

 

[bilk]

Do this first and enter password

sudo su

Hey thanks I was wanting to test this. Thanks for the info. Here's the results:

Last login: Fri Jan 11 00:07:09 on console
Bills-Mac-Pro:~ billMac$ sudo su

WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.

To proceed, enter your password, or type Ctrl-C to abort.

Password:
sh-3.2# time mkfile 4g /test
time cp
real 0m12.535s
user 0m0.678s
sys 0m11.851s
sh-3.2# time cp -p /test /test.2

real 0m8.042s
user 0m0.004s
sys 0m1.776s
sh-3.2#