Long loading time of a 60 MB matrix

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Trung Ngo
Trung Ngo 2019-7-2
评论： Trung Ngo 2019-7-3
Hi all,
I am currently having a 256GB SSD with a Sequential Read of 2.5GB/s, but loading a 60MB matrix took an average of 100.3 seconds to run. Is it possible if you can check my matrix -v7.3 to suggest me a method to speed up this loading process.
Should I convert it to -v6.0?

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per isakson
per isakson 2019-7-2
编辑：per isakson 2019-7-2
"loading a 60MB matrix took an average of 100.3 seconds"
>> tic, S=load('h:\m\cssm\110.mat'); toc
Elapsed time is 25.627453 seconds.
The variable is_land is 10GB (60MB is with compression)
>> S
S =
struct with fields:
is_land: [36023×36023 double]
x: [1×36023 double]
y: [1×36023 double]
>>
>> 36023^2*8/1e9
ans =
10.381
Only -v7.3 can handle a 10GB matrix.
However, is_land holds only zeros and ones. You may convert it to uint8 and save a factor eight. uint8 in combination with -v7.0 (or -v6.0) will be much faster.
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per isakson
per isakson 2019-7-2
No, my guess is that interp2 is reasonable fast.
Trung Ngo
Trung Ngo 2019-7-3
Thanks for your help, I will try to convert it to uint8

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