How to fix “java.lang.OutOfMemoryError: unable to create new native thread”

( ! ) Deprecated: Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /var/www/html/wp-includes/functions.php on line 6131
Call Stack
#	Time	Memory	Function	Location
1	0.0000	484048	{main}( )	.../index.php:0
2	0.0000	484400	require( '/var/www/html/wp-blog-header.php )	.../index.php:17
3	0.0911	4086096	require_once( '/var/www/html/wp-includes/template-loader.php )	.../wp-blog-header.php:19
4	0.0916	4115088	include( '/var/www/html/wp-content/themes/twentyfifteen/single.php )	.../template-loader.php:125
5	0.0916	4115088	get_header( $name = ???, $args = ??? )	.../single.php:10
6	0.0916	4115304	locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $load_once = TRUE, $args = [] )	.../general-template.php:48
7	0.0916	4115400	load_template( $_template_file = '/var/www/html/wp-content/themes/twentyfifteen/header.php', $load_once = TRUE, $args = [] )	.../template.php:749
8	0.0917	4115944	require_once( '/var/www/html/wp-content/themes/twentyfifteen/header.php )	.../template.php:814
9	0.0918	4123352	wp_head( )	.../header.php:18
10	0.0918	4123352	do_action( $hook_name = 'wp_head' )	.../general-template.php:3197
11	0.0918	4123568	WP_Hook->do_action( $args = [0 => ''] )	.../plugin.php:522
12	0.0918	4123568	WP_Hook->apply_filters( $value = '', $args = [0 => ''] )	.../class-wp-hook.php:365
13	0.0919	4126984	wp_enqueue_scripts( '' )	.../class-wp-hook.php:341
14	0.0919	4126984	do_action( $hook_name = 'wp_enqueue_scripts' )	.../script-loader.php:2311
15	0.0920	4127200	WP_Hook->do_action( $args = [0 => ''] )	.../plugin.php:522
16	0.0920	4127200	WP_Hook->apply_filters( $value = '', $args = [0 => ''] )	.../class-wp-hook.php:365
17	0.0921	4129088	twentyfifteen_scripts( '' )	.../class-wp-hook.php:341
18	0.0922	4130608	wp_style_add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' )	.../functions.php:440
19	0.0922	4130608	WP_Styles->add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' )	.../functions.wp-styles.php:245
20	0.0922	4130608	WP_Dependencies->add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' )	.../class-wp-styles.php:385
21	0.0922	4130608	_deprecated_argument( $function_name = 'WP_Dependencies->add_data()', $version = '6.9.0', $message = 'IE conditional comments are ignored by all supported browsers.' )	.../class-wp-dependencies.php:317
22	0.0922	4130928	wp_trigger_error( $function_name = '', $message = 'Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 )	.../functions.php:5925
23	0.0923	4137312	trigger_error( $message = 'Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 )	.../functions.php:6131

( ! ) Deprecated: Function WP_Dependencies->add_data() was called with an argument that is deprecated since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /var/www/html/wp-includes/functions.php on line 6131

Call Stack

Time

Memory

Function

Location

0.0000

484048

{main}( )

.../index.php:0

0.0000

484400

require( '/var/www/html/wp-blog-header.php )

.../index.php:17

0.0911

4086096

require_once( '/var/www/html/wp-includes/template-loader.php )

.../wp-blog-header.php:19

0.0916

4115088

include( '/var/www/html/wp-content/themes/twentyfifteen/single.php )

.../template-loader.php:125

0.0916

4115088

get_header( $name = ???, $args = ??? )

.../single.php:10

0.0916

4115304

locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $load_once = TRUE, $args = [] )

.../general-template.php:48

0.0916

4115400

load_template( $_template_file = '/var/www/html/wp-content/themes/twentyfifteen/header.php', $load_once = TRUE, $args = [] )

.../template.php:749

0.0917

4115944

require_once( '/var/www/html/wp-content/themes/twentyfifteen/header.php )

.../template.php:814

0.0918

4123352

wp_head( )

.../header.php:18

0.0918

4123352

do_action( $hook_name = 'wp_head' )

.../general-template.php:3197

0.0918

4123568

WP_Hook->do_action( $args = [0 => ''] )

.../plugin.php:522

0.0918

4123568

WP_Hook->apply_filters( $value = '', $args = [0 => ''] )

.../class-wp-hook.php:365

0.0919

4126984

wp_enqueue_scripts( '' )

.../class-wp-hook.php:341

0.0919

4126984

do_action( $hook_name = 'wp_enqueue_scripts' )

.../script-loader.php:2311

0.0920

4127200

WP_Hook->do_action( $args = [0 => ''] )

.../plugin.php:522

0.0920

4127200

WP_Hook->apply_filters( $value = '', $args = [0 => ''] )

.../class-wp-hook.php:365

0.0921

4129088

twentyfifteen_scripts( '' )

.../class-wp-hook.php:341

0.0922

4130608

wp_style_add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' )

.../functions.php:440

0.0922

4130608

WP_Styles->add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' )

.../functions.wp-styles.php:245

0.0922

4130608

WP_Dependencies->add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' )

.../class-wp-styles.php:385

0.0922

4130608

_deprecated_argument( $function_name = 'WP_Dependencies->add_data()', $version = '6.9.0', $message = 'IE conditional comments are ignored by all supported browsers.' )

.../class-wp-dependencies.php:317

0.0922

4130928

wp_trigger_error( $function_name = '', $message = 'Function WP_Dependencies->add_data() was called with an argument that is deprecated since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 )

.../functions.php:5925

0.0923

4137312

trigger_error( $message = 'Function WP_Dependencies->add_data() was called with an argument that is deprecated since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 )

.../functions.php:6131

( ! ) Deprecated: Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /var/www/html/wp-includes/functions.php on line 6131
Call Stack
#	Time	Memory	Function	Location
1	0.0000	484048	{main}( )	.../index.php:0
2	0.0000	484400	require( '/var/www/html/wp-blog-header.php )	.../index.php:17
3	0.0911	4086096	require_once( '/var/www/html/wp-includes/template-loader.php )	.../wp-blog-header.php:19
4	0.0916	4115088	include( '/var/www/html/wp-content/themes/twentyfifteen/single.php )	.../template-loader.php:125
5	0.0916	4115088	get_header( $name = ???, $args = ??? )	.../single.php:10
6	0.0916	4115304	locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $load_once = TRUE, $args = [] )	.../general-template.php:48
7	0.0916	4115400	load_template( $_template_file = '/var/www/html/wp-content/themes/twentyfifteen/header.php', $load_once = TRUE, $args = [] )	.../template.php:749
8	0.0917	4115944	require_once( '/var/www/html/wp-content/themes/twentyfifteen/header.php )	.../template.php:814
9	0.0918	4123352	wp_head( )	.../header.php:18
10	0.0918	4123352	do_action( $hook_name = 'wp_head' )	.../general-template.php:3197
11	0.0918	4123568	WP_Hook->do_action( $args = [0 => ''] )	.../plugin.php:522
12	0.0918	4123568	WP_Hook->apply_filters( $value = '', $args = [0 => ''] )	.../class-wp-hook.php:365
13	0.0919	4126984	wp_enqueue_scripts( '' )	.../class-wp-hook.php:341
14	0.0919	4126984	do_action( $hook_name = 'wp_enqueue_scripts' )	.../script-loader.php:2311
15	0.0920	4127200	WP_Hook->do_action( $args = [0 => ''] )	.../plugin.php:522
16	0.0920	4127200	WP_Hook->apply_filters( $value = '', $args = [0 => ''] )	.../class-wp-hook.php:365
17	0.0921	4129088	twentyfifteen_scripts( '' )	.../class-wp-hook.php:341
18	0.1192	4138416	wp_style_add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' )	.../functions.php:444
19	0.1192	4138416	WP_Styles->add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' )	.../functions.wp-styles.php:245
20	0.1192	4138416	WP_Dependencies->add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' )	.../class-wp-styles.php:385
21	0.1192	4138416	_deprecated_argument( $function_name = 'WP_Dependencies->add_data()', $version = '6.9.0', $message = 'IE conditional comments are ignored by all supported browsers.' )	.../class-wp-dependencies.php:317
22	0.1192	4138736	wp_trigger_error( $function_name = '', $message = 'Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 )	.../functions.php:5925
23	0.1193	4138960	trigger_error( $message = 'Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 )	.../functions.php:6131

Call Stack

Time

Memory

Function

Location

0.0000

484048

{main}( )

.../index.php:0

0.0000

484400

require( '/var/www/html/wp-blog-header.php )

.../index.php:17

0.0911

4086096

require_once( '/var/www/html/wp-includes/template-loader.php )

.../wp-blog-header.php:19

0.0916

4115088

include( '/var/www/html/wp-content/themes/twentyfifteen/single.php )

.../template-loader.php:125

0.0916

4115088

get_header( $name = ???, $args = ??? )

.../single.php:10

0.0916

4115304

locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $load_once = TRUE, $args = [] )

.../general-template.php:48

0.0916

4115400

load_template( $_template_file = '/var/www/html/wp-content/themes/twentyfifteen/header.php', $load_once = TRUE, $args = [] )

.../template.php:749

0.0917

4115944

require_once( '/var/www/html/wp-content/themes/twentyfifteen/header.php )

.../template.php:814

0.0918

4123352

wp_head( )

.../header.php:18

0.0918

4123352

do_action( $hook_name = 'wp_head' )

.../general-template.php:3197

0.0918

4123568

WP_Hook->do_action( $args = [0 => ''] )

.../plugin.php:522

0.0918

4123568

WP_Hook->apply_filters( $value = '', $args = [0 => ''] )

.../class-wp-hook.php:365

0.0919

4126984

wp_enqueue_scripts( '' )

.../class-wp-hook.php:341

0.0919

4126984

do_action( $hook_name = 'wp_enqueue_scripts' )

.../script-loader.php:2311

0.0920

4127200

WP_Hook->do_action( $args = [0 => ''] )

.../plugin.php:522

0.0920

4127200

WP_Hook->apply_filters( $value = '', $args = [0 => ''] )

.../class-wp-hook.php:365

0.0921

4129088

twentyfifteen_scripts( '' )

.../class-wp-hook.php:341

0.1192

4138416

wp_style_add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' )

.../functions.php:444

0.1192

4138416

WP_Styles->add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' )

.../functions.wp-styles.php:245

0.1192

4138416

WP_Dependencies->add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' )

.../class-wp-styles.php:385

0.1192

4138416

_deprecated_argument( $function_name = 'WP_Dependencies->add_data()', $version = '6.9.0', $message = 'IE conditional comments are ignored by all supported browsers.' )

.../class-wp-dependencies.php:317

0.1192

4138736

.../functions.php:5925

0.1193

4138960

.../functions.php:6131

I recently came across this exception on a couple of java systems that use many threads java.lang.OutOfMemoryError: unable to create new native thread. The strange thing was that the JVM had been assigned a lot of memory (1.5GB) and that it had at least half the memory available. Michele found this article that points out that the more memory you give to the JVM the more likely you are to get java.lang.OutOfMemoryError: unable to create new native thread exceptions when you have many threads.

Which makes perfect sense when you think about it. Each 32 bit process on Windows has 2GB “available” memory as 2GB is reserved to Windows. In my case the JVM grabbed 1.5 GB leaving 500MB. Part of the 500MB was used to map system dlls etc in memory so less than 400 MB was left. Now to the crucial point: When you create a thread in java it creates a Thread object in the JVM memory but it also creates a operating system thread. The operating system creates the thread with a thread stack in the 400MB that is left, not in the 1.5 GB allocated in the JVM. Java 1.4 uses a default stack size of 256kb but Java 1.5 uses a 1MB stack per thread. So, in the 400MB left to process I could only generate ~400 threads. Absurd but true: to create more threads you have to reduce the memory allocated to the JVM. Another option is to host the JVM in your own process using JNI.

This formula gives a decent estimate for the number of threads you can create:
(MaxProcessMemory – JVMMemory – ReservedOsMemory) / (ThreadStackSize) = Number of threads

For Java 1.5 I get the following results assuming that the OS reserves about 120MB:
1.5GB allocated to JVM: (2GB-1.5Gb-120MB)/(1MB) = ~380 threads
1.0GB allocated to JVM: (2GB-1.0Gb-120MB)/(1MB) = ~880 threads

Java 1.4 uses 256kb for the thread stack which lets you create a lot more threads:
1.5GB allocated to JVM: ~1520 threads
1.0GB allocated to JVM: ~3520 threads

I have not tried the 3GB switch but it should in theory let you create more threads.

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