selectImage(title) is slow in Java 8

[vischer]

Hi all,

the macro below shows that "selectImage(title)" often has a 2000 ms wait time.
I did not observe this in Java 6. Is there an easy fix?

Norbert




ImageJ 1.51k4; Java 1.8.0_101 [64-bit]; Mac OS X 10.11.3; 37MB of 7000MB (<1%)

//--- macro begin
run("Close All");
for(num=1; num <=6; num++){
        title = "Img_" + num;
        newImage(title, "8-bit ramp", 800, 600, 1);

}
print("\\Clear");
for(loop = 1; loop <= 3; loop++){
        print(loop);
        for(num=1; num <=6; num++){
                title = "Img_" + num;
                time = getTime;
                selectImage(title);
                print(title,  "time[ms]: ", getTime-time);
        }
}
//--- macro end

output:
=======
1
Img_1 time[ms]:  13
Img_2 time[ms]:  11
Img_3 time[ms]:  2004
Img_4 time[ms]:  11
Img_5 time[ms]:  21
Img_6 time[ms]:  13
2
Img_1 time[ms]:  10
Img_2 time[ms]:  10
Img_3 time[ms]:  2002
Img_4 time[ms]:  13
Img_5 time[ms]:  10
Img_6 time[ms]:  2007
3
Img_1 time[ms]:  20
Img_2 time[ms]:  10
Img_3 time[ms]:  11
Img_4 time[ms]:  2013
Img_5 time[ms]:  11
Img_6 time[ms]:  13

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[Gabriel Landini]

On Friday, 10 February 2017 11:58:13 GMT Norbert Vischer wrote:
> the macro below shows that "selectImage(title)" often has a 2000 ms wait
> time. I did not observe this in Java 6. Is there an easy fix?

Hi Norbert, I think this window select and window create slowdowns have been
going on since 1.7.

Your macro is not  slow on my machine (linux) (10 to 11 ms per image) but
there is a very noticeably difference in speed in the "Stack to Images"
command between 1.6 and 1.8.

Cheers

Gabriel

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[Wayne Rasband-2]

> On Feb 10, 2017, at 5:58 AM, Norbert Vischer <[hidden email]> wrote:
>
> Hi all,
>
> the macro below shows that "selectImage(title)" often has a 2000 ms wait time.
> I did not observe this in Java 6. Is there an easy fix?

The latest ImageJ daily build (1.51k5) reduces the selectImage() timeout to 250 ms when ImageJ is running on OS X and Java 8. The timeout is the amount of time selectImage() waits for the image window to be activated. On OS X and Java 8, the window activated event sometimes does not occur after selectImage() calls toFront() on the image window.

-wayne

> ImageJ 1.51k4; Java 1.8.0_101 [64-bit]; Mac OS X 10.11.3; 37MB of 7000MB (<1%)
>
> //--- macro begin
> run("Close All");
> for(num=1; num <=6; num++){
> title = "Img_" + num;
> newImage(title, "8-bit ramp", 800, 600, 1);
>
> }
> print("\\Clear");
> for(loop = 1; loop <= 3; loop++){
> print(loop);
> for(num=1; num <=6; num++){
> title = "Img_" + num;
> time = getTime;
> selectImage(title);
> print(title,  "time[ms]: ", getTime-time);
> }
> }
> //--- macro end
>
> output:
> =======
> 1
> Img_1 time[ms]:  13
> Img_2 time[ms]:  11
> Img_3 time[ms]:  2004
> Img_4 time[ms]:  11
> Img_5 time[ms]:  21
> Img_6 time[ms]:  13
> 2
> Img_1 time[ms]:  10
> Img_2 time[ms]:  10
> Img_3 time[ms]:  2002
> Img_4 time[ms]:  13
> Img_5 time[ms]:  10
> Img_6 time[ms]:  2007
> 3
> Img_1 time[ms]:  20
> Img_2 time[ms]:  10
> Img_3 time[ms]:  11
> Img_4 time[ms]:  2013
> Img_5 time[ms]:  11
> Img_6 time[ms]:  13
>
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[vischer]

Hi Wayne and Gabriel,

> The latest ImageJ daily build (1.51k5) reduces the selectImage() timeout to 250 ms when ImageJ is running on OS X and Java 8. The timeout is the amount of time selectImage() waits for the image window to be activated. On OS X and Java 8, the window activated event sometimes does not occur after selectImage() calls toFront() on the image window.
>
> -wayne


thanks Wayne for the work-around. Now about every second call hits the 250 ms, so I wonder what will be the disadvantage in these cases?
The modified macro (below) makes tests in 4 loops, where loop 3 and 4 introduce BatchMode statements. This reduced the time to 0 msec.

Norbert


ImageJ 1.51k5; Java 1.8.0_101 [64-bit]; Mac OS X 10.10.3; 15MB of 3000MB (<1%)

//--- macro (with BatchMode statements) begin
run("Close All");
for(num=1; num <=6; num++){
        title = "Img_" + num;
        newImage(title, "8-bit ramp", 800, 600, 1);

}
print("\\Clear");
for(loop = 1; loop <= 4; loop++){
        print(loop);
        for(num=1; num <=6; num++){
                title = "Img_" + num;
                time = getTime;
                if(loop>2) setBatchMode(true);
                selectImage(title);
                if(loop>2) setBatchMode(false);
                print(title,  "time[ms]: ", getTime-time);
        }
}
selectWindow("Log");
//--- macro end


Output:
=======
1
Img_1 time[ms]:  60
Img_2 time[ms]:  31
Img_3 time[ms]:  254
Img_4 time[ms]:  58
Img_5 time[ms]:  263
Img_6 time[ms]:  23
2
Img_1 time[ms]:  57
Img_2 time[ms]:  32
Img_3 time[ms]:  253
Img_4 time[ms]:  36
Img_5 time[ms]:  261
Img_6 time[ms]:  23
3
Img_1 time[ms]:  0
Img_2 time[ms]:  0
Img_3 time[ms]:  0
Img_4 time[ms]:  0
Img_5 time[ms]:  0
Img_6 time[ms]:  0
4
Img_1 time[ms]:  0
Img_2 time[ms]:  0
Img_3 time[ms]:  0
Img_4 time[ms]:  0
Img_5 time[ms]:  0
Img_6 time[ms]:  0

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[Gabriel Landini]

While we are discussing this, I'll mention this other issue (I think I have
posted about it before, but I do not seem to be able to search the list
archive to check if I did, for some reason).
The macro below is about 7 times slower in java 8 and 7, compared with java 6
in linux when you run in "Normal mode":

setBatchMode(true);
run("MRI Stack (528K)");
t=getTime();
run("Stack to Images");
print ("Batch mode: "+getTime()-t);
run("Images to Stack", "name=Stack title=[] use");
setBatchMode(false);
t2=getTime();
run("Stack to Images");
print ("Normal mode: "+getTime()-t2);
run("Images to Stack", "name=Stack title=[] use");

Cheers

Gabriel

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[vischer]

Hi Gabriel,
on my Macbook Air, Java 8 is factor 1.3 slower:

Java 6:
ImageJ 1.51j15; Java 1.6.0_65 [64-bit]; Mac OS X 10.10.3; 8554K of 3000MB (<1%)
Batch mode: 5
Normal mode: 3165

Java 8:
ImageJ 1.51k5; Java 1.8.0_101 [64-bit]; Mac OS X 10.10.3; 39MB of 3000MB (1%)
Batch mode: 2
Normal mode: 4264

Best regards, Norbert

> While we are discussing this, I'll mention this other issue (I think I have
> posted about it before, but I do not seem to be able to search the list
> archive to check if I did, for some reason).
> The macro below is about 7 times slower in java 8 and 7, compared with java 6
> in linux when you run in "Normal mode":
>
> setBatchMode(true);
> run("MRI Stack (528K)");
> t=getTime();
> run("Stack to Images");
> print ("Batch mode: "+getTime()-t);
> run("Images to Stack", "name=Stack title=[] use");
> setBatchMode(false);
> t2=getTime();
> run("Stack to Images");
> print ("Normal mode: "+getTime()-t2);
> run("Images to Stack", "name=Stack title=[] use");

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[Gabriel Landini]

On Sunday, 12 February 2017 16:33:26 GMT Norbert Vischer wrote:
> on my Macbook Air, Java 8 is factor 1.3 slower:

Thanks Norbert, I tried also openjdk 1.8 and it is as slow as the oracle Java.
I do not think it is a window manager (KDE) issue, otherwise Java 1.6 would be
slow too.

Cheers

Gabriel

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