Javascript Memory Issues – Stack Exchange Webmasters

I am currently experiencing memory problems with my website. Once the page is open, Chrome uses approximately 270 MB of memory. After a while, it slips and starts generating bugs at about 450 MB. However, when I look at the performance section of Chrome's development tools, my JS Heap never exceeds 10 MB. It's highly likely that I misunderstood what is JS Heap.

When the web page begins to mess up, the "raster" section stays green and the CPU section displays green lines diagonally. In addition, the situation worsens when I scroll down and the FPS increases. Does anyone have an idea of ​​what's going on? What could take all this memory? How can I fix it?

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windows – Help to save memory!

I tell you that I have an application that crashes suddenly and that Windows displays a message stating that the interaction with the program has been lost. It must therefore be closed.
I have generated a dump file from the memory but I can not find the error.
Thanks for your help.
I share what Windbg shows me!

KEY_VALUES_STRING: 1

Password: Analysis.CPU.Sec
Value: 0

Password: Analysis.Elapsed.Sec
Value: 0

Password: Analysis.Memory.CommitPeak.Mb
Value: 71

Password: Timeline.OS.Boot.DeltaSec
Value: 83483

Password: Timeline.Process.Start.DeltaSec
Value: 522

PROCESSES_ANALYSIS: 1

SERVICE_ANALYSIS: 1

STACKHASH_ANALYSIS: 1

TIME ANALYSIS: 1

Timeline:! Analyze Start
Name:
Time: 2019-06-20T02: 59: 55.206Z
Diff: 17239206 meg.

Chronology: reversed. Current
Name:
Time: 2019-06-19T22: 12: 36.0Z
Diff: 0 mSeg.

Chronology: process. Home
Name:
Time: 2019-06-19T22: 03: 54.0Z
Diff: 522000 megabytes

Timeline: OS.Boot
Name:
Time: 2019-06-18T23: 01: 13.0Z
Diff: 83483000 meg

DUMP_CLASS: 2

DUMP_QUALIFIER: 400

MODLIST_WITH_TSCHKSUM_HASH: 56de462128221679ea1761bc3a3f174194157287

MODLIST_SHA1_HASH: eb6d8c36586826f9b1e2a34257aa60406290ff7a

NTGLOBALFLAG: 0

APPLICATION_VERIFIER_FLAGS: 0

PRODUCT_TYPE: 1

SUITE_MASK: 336

DUMP_FLAGS: c07

DUMP_TYPE: 3

FAULTING_IP:
0
00000000`00000000 ?? ???

EXCEPTION_RECORD: (.exr -1)
Exception address: 0000000000000000
Exception code: 80000003 (exception of interruption instruction)
ExceptionFlags: 00000000
Number of parameters: 0

FAULTING_THREAD: 00000c94

BUGCHECK_STR: BREAKPOINT

DEFAULT_BUCKET_ID: BREAKPOINT

PROCESS_NAME: interopEXE.exe

ERROR_CODE: (NTSTATUS) 0x80000003 – {EXCEPTION} Stopping Point A stopping point has been reached.

EXCEPTION_CODE: (HRESULT) 0x80000003 (2147483651) – One or more arguments are invalid.

EXCEPTION_CODE_STR: 80000003

WATSON_BKT_PROCSTAMP: 5c880025

WATSON_BKT_PROCVER: 3.1.2.0

PROCESS_VER_PRODUCT: Cpi connectivity

WATSON_BKT_MODULE: unknown

WATSON_BKT_MODVER: 0.0.0.0

WATSON_BKT_MODOFFSET: 0

WATSON_BKT_MODSTAMP: bbbbbbb4

BUILD_VERSION_STRING: 6.1.7601.23796 (win7sp1_ldr.170427-1518)

ANALYSIS_SESSION_HOST: DESKTOP-BN

ANALYSIS_SESSION_TIME: 06-19-2019 20: 59: 55.0206

ANALYSIS_VERSION: 10.0.18869.1002 amd64fre

THREAD_ATTRIBUTES:
OS_LOCALE: ESE

PRIMARY_PROBLEM_CLASS: BREAKPOINT

PROBLEM_CLASSES:

ID: [0n321]
Type: [@APPLICATION_FAULT_STRING]
Class: primary
Scope: DEFAULT_BUCKET_ID (error cube ID prefix)
BUCKET_ID
Name: Pass
Data: Add
Chain: [BREAKPOINT]
PID: [no especificado]
TID: [no especificado]
Marco: [0]

LAST_CONTROL_TRANSFER: from 0000000074a02bf1 to 0000000074a02e09

STACK_TEXT:
000000000013e468 0000000074a02bf1: 00000000767e074d 000000007eec0023 0000000000000246 000000000038d938: wow64cpu! CpupSyscallStub + 0x9
000000000013e470 0000000074a7d286: 0000000000000000 0000000074a01920 fffffffffffffffe 000000000000001d: wow64cpu! Thunk0ArgReloadState + 0x23
000000000013e530 0000000074a7c69e: 0000000000000000 0000000000000000 0000000074a74b10 000000007ffe0030: wow64! RunCpuSimulation + 0xa
000000000013e580 0000000076e3fb96: 0000000000563230 0000000000000000 0000000076f2d670 0000000076f00910: wow64! Wow64LdrpInitialize + 0x42a
000000000013ead0 0000000076e9bd09: 0000000000000000 0000000076e3f3b1 000000000013f080 0000000000000000: ntdll! LdrpInitializeProcess + 0x17e3
000000000013efc0 0000000076e2a36e: 000000000013f080 0000000000000000 000000007efdf000 0000000000000000: ntdll! ?? :: FNODOBFM :: string + 0x22a30
00000000
0013f030 0000000000000000: 0000000000000000 0000000000000000 0000000000000000 00000000`00000000: ntdll! LdrInitializeThunk + 0xe

STACK_COMMAND: ~ 0s; .ecxr; kb

THREAD_SHA1_HASH_MOD_FUNC: 01470e8c2fda97324518d4d4636a1ab62077ff45

THREAD_SHA1_HASH_MOD_FUNC_OFFSET: bc6c3854197bdd38c1e227ddc278905bb63a23fc

THREAD_SHA1_HASH_MOD: 31cc8129c2e727f537d516c2527e18338fe11819

FOLLOWUP_IP:
wow64cpu! CpupSyscallStub + 9
00000000`74a02e09 c3 ret

FAULT_INSTR_CODE: ccccccc3

SYMBOL_STACK_INDEX: 0

SYMBOLO_NAME: wow64cpu! CpupSyscallStub + 9

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: wow64cpu

IMAGE_NAME: wow64cpu.dll

DEBUG_FLR_IMAGE_TIMESTAMP: 5902971d

BUCKET_ID: X64_BREAKPOINT_wow64cpu! CpupSyscallStub + 9

FAILURE_EXCEPTION_CODE: 80000003

FAILURE_IMAGE_NAME: wow64cpu.dll

BUCKET_ID_IMAGE_STR: wow64cpu.dll

FAILURE_MODULE_NAME: wow64cpu

BUCKET_ID_MODULE_STR: wow64cpu

FAILURE_FUNCTION_NAME: CpupSyscallStub

BUCKET_ID_FUNCTION_STR: CpupSyscallStub

BUCKET_ID_OFFSET: 9

BUCKET_ID_MODTIMEDATESTAMP: 5902971d

BUCKET_ID_MODCHECKSUM: e2e8

BUCKET_ID_MODVER_STR: 6.1.7601.23796

BUCKET_ID_PREFIX_STR: X64_BREAKPOINT_

FAILURE_PROBLEM_CLASS: BREAKPOINT

FAILURE_SYMBOL_NAME: wow64cpu.dll! CpupSyscallStub

FAILURE_BUCKET_ID: BREAKPOINT_80000003_wow64cpu.dll! CpupSyscallStub

TARGET_TIME: 2019-06-19T22: 12: 36.000Z

OSBUILD: 7601

OSSERVICEPACK: 23796

SERVICEPACK_NUMBER: 0

OS_REVISION: 0

OSPLATFORM_TYPE: x64

OSNAME: Windows 7

SOEDITION: Windows 7 Windows NT (Service Pack 1) EmbeddedNT SingleUserTS

USER_LCID: 0

OSBUILD_TIMESTAMP: 2017-04-27 18:35:36

BUILDDATESTAMP_STR: 170427-1518

BUILDLAB_STR: win7sp1_ldr

BUILDOSVER_STR: 6.1.7601.23796

ANALYSIS_SESSION_ELAPSED_TIME: 3c5

ANALYSIS_SOURCE: UM

FAILURE_ID_HASH_STRING: um: breakpoint_80000003_wow64cpu.dll! Cpupsyscallstub

FAILURE_ID_HASH: {289a12fb-10fd-bb5b-3edc-4567046643a5}

Follow up: Machine owner

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Dovecot / Postfix can not allocate memory

I have a VPS with 8GB of memory and running Ubuntu 16.04.02 with Plesk Onyx.

Since a moment, the system is regularly blocked on dovecote and / or postfix.

Dovecot Version: 2.3.4.1-ubuntu16.04.19031416
Postfix Version: 3.1.0-3ubuntu0.3

I do not find how to solve this problem.

This server is mainly used for email (imap) and 1 small WordPress website with little traffic.

Sometimes, just restart the Dovecot or Postfix service.
But sometimes I have to restart my entire server

Error in mail.log since the beginning of the incident.

> 18 June 11:55:30 h2648771 dovecote: imap-login: error: master (imap):
> net_connect_unix (imap) failed: unable to allocate memory
> (client-pid = 29864, client-id = 1, rip = 188.207.4.90, created there are 0 ms,
> received 0/4 bytes) June 18th at 11:55:30 h2648771 dovecote: imap-login:
> Error: master (imap): net_connect_unix (imap) failed: unable to allocate.
> memory (client-pid = 29866, client-id = 1, rip = 188.207.4.90, created 0
> there is msec, received 0/4 bytes) June 18 at 11:55:30 h2648771 dovecot:
> imap-login: Error: socketpair () failed: unable to allocate memory:
> user =, method = PLAIN, rip = 188.207.4.90,
> lip = 85.214.19.175, TLS, session = June 18th 11:55:30
> h2648771 dovecote: imap-login: error: net_connect_unix (anvil) failed:
> Unable to allocate memory June 18 at 11:55:30 h2648771 dovecote: master:
> Error: service (imap-login): failure to start the command, limitation for 2
> seconds 18 June 11:55:30 h2648771 dovecote: imap: error:
> net_connect_unix (/ var / run / dovecot / stats-writer) failed: impossible
> allocate memory June 18 11:55:30 h2648771 dovecote: imap: error:
> net_connect_unix (/ run / dovecot / auth-master) failed: unable to allocate.
> memory

etc / dovecot / dovecot.conf:

## Dovecot configuration file

# PLEASE DO NOT edit anything in this file! ANY CHANGE WILL BE LOST IN UPGRADING.
# Add your custom configuration to /etc/dovecot/conf.d/
# See the end of this file for more details on customization.

# See examples of configuration files in / usr / share / doc / dovecot / example-config /
# See the stock configuration files in / usr / share / doc / plesk-dovecot / dist-config /


# Separate list of search mechanisms searched.
# NOTE: See also the disable_plaintext_auth parameter.
auth_mechanisms = complete identifier dig-md5 cram-md5 apop

# The valid UID range must include popuser.
first_valid_uid = 30

# List of characters allowed in the user name. "& # 39; &" is added here to the default list.
auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890 &.-_ @ & # 39;

# Layout of Plesk Maildirs.
mail_home = / var / qmail / mail names /% Ld /% Ln
mail_location = maildir: / var / qmail / mail names /% Ld /% Ln / Maildir

# Enable support for the Maildir ++ quota.
mail_plugins = $ quota mail_plugins

connect {
# Take the quota limits of the maildirsize file. If it does not exist, do not apply.
quota = maildir: user quota
# LDA / LMTP saves the last mail to take the user of the sub-quota to
# on quota, if the quota does not increase too much. The default is to allow
# as long as the quota remains below 10% above the limit. Also allowed for example 10M.
# 0 does not allow to exceed the quota (compatibility with the Courier-IMAP behavior).
quota_grace = 0
}


auth service {
# Allow userdb searches for popuser.
unix_listener auth-userdb {
mode = 0600
user = popuser
group = popuser
}
}


# Certificate and private key X.509 SSL / TLS encoded PEM.
ssl_cert = </etc/dovecot/private/ssl-cert-and-key.pem
ssl_key = </etc/dovecot/private/ssl-cert-and-key.pem


# Support for protocols.

protocols = imap pop3

imap {protocol
mail_plugins = $ mail_plugins imap_quota
}

pop3 protocol {
# POP3 UIDL format similar to the one used by Courier-IMAP.
pop3_uidl_format = UID% u-% v
}

# Workarounds for various client bugs.
imap_client_workarounds = delay-newmail
pop3_client_workarounds = perspectives-no-ness oe-ns-eoh


# Configuration of the default private namespace compatible with Courier-IMAP.

namespace mailbox {
separator =.
prefix = INBOX.
inbox = yes
}


# Recording verbosity and debugging.

# Record failed authentication attempts and reasons for their failure.
#auth_verbose = yes

# If the password does not match, save the password you tried. Valid values ​​are
# no, simple and sha1. sha1 can be useful for detecting brute force password
# attempts against user simply trying the same password again and again.
#auth_verbose_passwords = no

# Recording even more detailed for debugging purposes.
#auth_debug = yes

# In case of password mismatch, save the passwords and the schema used in order
# problem can be debugged. Enabling this also enables auth_debug.
#auth_debug_passwords = yes

# Enable debugging of the messaging process. This can help you understand why Dovecot
# can not find your mails
#mail_debug = yes

# Displays SSL errors at the protocol level.
#verbose_ssl = yes


# Log format compatible with the Plesk statistics collector.
mail_log_prefix = "service =% s, user =% u, ip =[%r]. "
pop3_logout_format = "rcvd =% i, sent =% o, high =% t /% p, retr =% r /% b, del =% d /% m, size =% s"
imap_logout_format = "rcvd =% i, sent =% o"

# The customizable part of the configuration is included below. Filenames are
# first sorted by their ASCII value and analyzed in that order. The prefixes 00
The file names in # are intended to facilitate the understanding of the command.
#
# Prefixes 10 to 20 and 90 to 95 (inclusive) are reserved for Plesk.
# Do not occupy them and do not edit files with these prefixes!
! include conf.d / *. conf

# vim: ts = 2 m = 2 sw = 2 and:

etc / postfix / main.cf:

# See /usr/share/postfix/main.cf.dist for a commented and more complete version


# Debian-specific: Specifying a file name will cause the first
# line of this file to use as the name. The Debian default
# is / etc / mailname.
#myorigin = / etc / mailname

smtpd_banner = $ myhostname ESMTP $ mail_name (Ubuntu)
biff = no

# addending .domain is the work of the MUA.
append_dot_mydomain = no

# Uncomment the following line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS settings
smtpd_tls_cert_file = /etc/postfix/postfix.pem
smtpd_tls_key_file = $ smtpd_tls_cert_file
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree: $ {data_directory} / smtpd_scache
smtp_tls_session_cache_database = btree: $ {data_directory} / smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# SSL activation information in the SMTP client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = h1234567.stratoserver.net
alias_maps = hash: / etc / aliases, hash: / var / spool / postfix / plesk / alias
alias_database = hash: / etc / aliases
my origin = / etc / mailname
mydestination = localhost.stratoserver.net, localhost, localhost.localdomain
mynetworks =
mailbox_command = procmail -a "$ EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_protocols = all
virtual_mailbox_domains = $ virtual_mailbox_maps, hash: / var / spool / postfix / plesk / virtual_domains
virtual_alias_maps = $ virtual_maps, hash: / var / spool / postfix / plesk / virtual
virtual_mailbox_maps =, hash: / var / spool / postfix / plesk / vmailbox
transport_maps =, hash: / var / spool / postfix / plesk / transport
smtpd_tls_security_level = can
smtp_tls_security_level = can
smtp_use_tls = no
smtpd_timeout = 3600s
smtpd_proxy_timeout = 3600s
disable_vrfy_command = yes
smtpd_sender_restrictions = hash check_sender_access: / var / spool / postfix / plesk / blacklist, permit_sasl_authenticated
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated
smtp_send_xforward_command = yes
smtpd_authorized_xforward_hosts = 127.0.0.0/8 [::1]/ 128
smtpd_sasl_auth_enable = yes
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, ject_unauth_destination
virtual_mailbox_base = / var / qmail / e-mail names
virtual_uid_maps = static: 30
virtual_gid_maps = static: 31
smtpd_milters =, inet: 127.0.0.1: 12768
sender_dependent_default_transport_maps = hash: / var / spool / postfix / plesk / sdd_transport_maps
virtual_transport = plesk_virtual
plesk_virtual_destination_recipient_limit = 1
mailman_destination_recipient_limit = 1
message_size_limit = 1024000000
virtual_mailbox_limit = 0
recipient_canonical_maps = tcp: 127.0.0.1: 12346
recipient_canonical_classes = envelope_designer, address_address
smtpd_tls_ciphers = medium
smtpd_tls_mandatory_ciphers = medium
tls_medium_cipherlist = HIGH :! aNULL :! MD5
smtpd_tls_mandatory_protocols = TLSv1 TLSv1.1 TLSv1.2
smtpd_tls_protocols = TLSv1 TLSv1.1 TLSv1.2
mynetworks_style = subnet
allowed_flush_users =
allowed_mailq_users =
inet_interfaces = all

Does everyone know how to solve this problem?

Find prime numbers, memory error

I was trying to write Sieve for the first time and I come with this code

def sieve (num):
numbers = together (range (3, num, 2))
for i in the range (3, int (num ** (1/2))):
num_set = {i * c for c in the interval (i, num // 2)}
numbers = numbers - num_set
returns the list (sorted ((2, * numbers)))

The problem is that for num> 10 ** 6 the time needed to create prime numbers increases.

Also, when I tried num = 10 ** 8 my computer stopped working, started making strange noises and I had to restart it.

I think the problem is that I deal with sets. For large numbers (for example, in num = 10 ** 8 case) the set can not be produced because my computer can not process as much information, so it stops.

Is there a way to solve this memory or time problem using my code or should I use a different algorithm?

CPU memory – Are the CPU registers part of the primary memory?

A friend of mine recently took part in an exam. One of the questions asked concerned the CPU registers, which has two points:

  • (a) The CPU registers are part of the primary memory
  • (b) They are volatile

And the choices were:

  1. Both (a) and (b) are true
  2. Only (a) is true
  3. Only (b) is true
  4. none of these answers

They are volatile. Thus, the third and fourth options can be avoided. The confusion was whether it was part of the primary memory. To my knowledge, processor caches, RAMs, and ROMs can be called main memory. But will the CPU registers be called as part of the primary memory? Or will it be considered level 0 caches?

simultaneity – Multithreaded parametric programs with superexponential shared memory size in the number of threads?

In this question, a program designates a parameterized multithreaded program with interleaving semantics, a finite number of states per thread (which can depend on the number of threads) and a finite number of shared states (which may depend on the number of threads) .

A shared state is a valuation of shared memory, and a per thread (in another terminology, local) State is the valuation of the memory thread-local (we assume no stack). interweaving semantics means that threads' actions are interleaved on a single processor and that a thread has direct access to shared memory and its own local memory, with no access to local memories of other threads. parameterized means that we consider a family of programs generated from a finite description model such as the $ n $The family member has $ n $ threads (which usually coincide up to the thread identifier).

To the best of my knowledge, for such a program, the size of the shared state space is between constant (for example, for a single Boolean lock variable) and exponential (for example, protocol of #). Peterson's mutual exclusion) in the number of threads. $ n $.

Is there a well-known academic program in which the size of the shared state space increases superexponentially in $ n $?

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