Good morning, this is what i get from apache error
Fatal Error Unable to allocate shared memory segment of 134217728 bytes: mmap: Cannot allocate memory (12)
This is my ipcs -lm
------ Limiti della memoria condivisa --------
max number of segments = 4096
max seg size (kbytes) = 131072
max total shared memory (kbytes) = 536870912
dimensione min seg (byte) = 1
This is cat /etc/sysctl.conf
# Controls the default maxmimum size of a mesage queue
# kernel.msgmnb = 65536
# Controls the maximum size of a message, in bytes
# kernel.msgmax = 65536
# Controls the maximum shared segment size, in bytes
# kernel.shmmax = 200000000
# Controls the maximum number of shared memory segments, in pages
# kernel.shmall = 50000
#
I've set unlimit to unlimited, and i've tryed all the things present on internet.
Can you please tell me what's wrong?
first of all,
please consider to remove # sign before
# kernel.shmmax = 200000000
# kernel.shmall = 50000
like this:
# Controls the maximum shared segment size, in bytes
kernel.shmmax = 200000000
# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 50000
Related
I'm trying to create a estimation of the size of a chain if i create a new blockchain using hyperldger.
In order to have an idea of disk space usage i would like to know that is the average size of a default block in the hyperldger fabric.
Thank you before hand,
Best Regards
Bellow you can find default configuration provided for ordering service. You can actually control block size with BatchTimeout and BatchSize parameters, also note that this is pretty use case dependent as it relies on transaction size, i.e. the logic of your chaincode.
################################################################################
#
# SECTION: Orderer
#
# - This section defines the values to encode into a config transaction or
# genesis block for orderer related parameters
#
################################################################################
Orderer: &OrdererDefaults
# Orderer Type: The orderer implementation to start
# Available types are "solo" and "kafka"
OrdererType: solo
Addresses:
- orderer.example.com:7050
# Batch Timeout: The amount of time to wait before creating a batch
BatchTimeout: 2s
# Batch Size: Controls the number of messages batched into a block
BatchSize:
# Max Message Count: The maximum number of messages to permit in a batch
MaxMessageCount: 10
# Absolute Max Bytes: The absolute maximum number of bytes allowed for
# the serialized messages in a batch.
AbsoluteMaxBytes: 98 MB
# Preferred Max Bytes: The preferred maximum number of bytes allowed for
# the serialized messages in a batch. A message larger than the preferred
# max bytes will result in a batch larger than preferred max bytes.
PreferredMaxBytes: 512 KB
The value is configured:
################################################################################
# SECTION: Orderer
################################################################################
Orderer: &OrdererDefaults
OrdererType: solo
Addresses:
#- orderer0.ordererorg:7050
- orderer0:7050
Kafka:
Brokers:
BatchTimeout: 2s
BatchSize:
MaxMessageCount: 10
AbsoluteMaxBytes: 98 MB
PreferredMaxBytes: 512 KB
Organizations:
The file is located in configtx.yaml, and it is defined in config.go.
// BatchSize contains configuration affecting the size of batches.
type BatchSize struct {
MaxMessageCount uint32 `yaml:"MaxMessageSize"`
AbsoluteMaxBytes uint32 `yaml:"AbsoluteMaxBytes"`
PreferredMaxBytes uint32 `yaml:"PreferredMaxBytes"`
}
The values are set according the configtx.yaml file above.
If I am not wrong, than with triple indirect addressing, the maximum file size for ext3 would be (4G+4M+4K).
Likewise, what will be the the maximum file size for an ext4 FS using extents if we assume a 4KB disk block size?
BS = Block size = 4 KiB
You missed the 12 direct pointers in your calculation for ext3:
(12*BS = 48 KiB) + 4 MiB + 4 GiB + 4 TiB
For ext4, we use 32-bit indexing for the extents:
2^32 * (BS = 2^12) = 2^44 = 16 TiB
which is the number you would e.g. also find on Wikipedia for the maximum ext4 file size.
I read a tutorial about writing a bootloader. The author gave this as an example of a boot parameter block:
bootsector:
iOEM: .ascii "DevOS " # OEM String
iSectSize: .word 0x200 # bytes per sector
iClustSize: .byte 1 # sectors per cluster
iResSect: .word 1 # #of reserved sectors
iFatCnt: .byte 2 # #of FAT copies
iRootSize: .word 224 # size of root directory
iTotalSect: .word 2880 # total # of sectors if over 32 MB
iMedia: .byte 0xF0 # media Descriptor
iFatSize: .word 9 # size of each FAT
iTrackSect: .word 9 # sectors per track
iHeadCnt: .word 2 # number of read-write heads
iHiddenSect: .int 0 # number of hidden sectors
iSect32: .int 0 # # sectors for over 32 MB
iBootDrive: .byte 0 # holds drive that the boot sector came from
iReserved: .byte 0 # reserved, empty
iBootSign: .byte 0x29 # extended boot sector signature
iVolID: .ascii "seri" # disk serial
acVolumeLabel: .ascii "MYVOLUME " # volume label
acFSType: .ascii "FAT16 " # file system type
If I am using a FAT32 file system can I just change the last part (acFSType: ascii “FAT16 “) and use this boot parameter block? If not where can I get a boot parameter block for FAT32?
I asked Mike Saunders ( the author of Mike-OS) in an email and his answer was no. I can't use this table for FAT32 just by changing that (acFSType: ascii “FAT16 “)part. To get a boot parameter block for the FAT32 file-system he sent me this link to the Microsoft website.
I want to limit the number of threads I create based on the amount of free physical memory. For instance I want to stop making new threads once I reach the point that there is only 7GB of real memory left. How would I do so?
You can use Devices.ComputerInfo to get the total amount of free physical memory:
Dim info = New Microsoft.VisualBasic.Devices.ComputerInfo()
Dim gb = info.AvailablePhysicalMemory / 1024 / 1024 / 1024
While gb >= 7
' start your threads here ... '
gb = info.AvailablePhysicalMemory / 1024 / 1024 / 1024
End While
I am trying to allocate ram with xms = xmx on a sles10 x64 running under VMware.
When stopping the JVM the following error is thrown:
Java HotSpot(TM) 64-Bit Server VM warning: Failed to reserve shared memory (errno = 12).
The RAM of the VM is 8 GB and they are reserved.
The VM sees 8GB and it can be allocated during runtime via the XMX setting.
On another Virtual SLES10 with 16 GB RAM Reserved via VMWare I don't have a problem with allocation of RAM even when setting the hugepages and shmax only by echo it works fine.
echo 8000 > /proc/sys/vm/nr_hugepages
echo 8589934592 > /proc/sys/kernel/shmmax
Using the echo commands on the other SLES10 show no effect in /proc/meminfo at all.
here are my configs 1st on is the SLES10 where XMS fails to allocate.
# more /apps/liferay-portal-5.2.5/tomcat-5.5.27/bin/setenv.sh
JAVA_HOME=/apps/java5
JRE_HOME=/apps/java5
JAVA_OPTS="$JAVA_OPTS -Xms3G -Xmx3G -XX:NewRatio=3 -XX:MaxPermSize=256m -XX:SurvivorRatio=20 -Dsun.rmi.dgc.client.gcInterval=1800000 -Dsun.rmi.dgc.server.gcInterval=1800000 -XX:+UsePa
rallelGC -XX:ParallelGCThreads=4 -XX:+UseLargePages -Xloggc:/apps/gc.log -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGC -XX:+PrintGCTimeStamps -
XX:+PrintGCDetails -Dfile.encoding=UTF8 -Duser.timezone=GMT+2 -Djava.security.auth.login.config=$CATALINA_HOME/conf/jaas.config -Dorg.apache.catalina.loader.WebappClassLoader.ENABLE_C
LEAR_REFERENCES=false"
more /etc/sysctl.conf
kernel.shmmax=7516192768
vm.nr_hugepages=3072
vm.hugetlb_shm_group=1000
more /etc/securtiy/limits.conf
#
#
#* soft core 0
#* hard rss 10000
##student hard nproc 20
##faculty soft nproc 20
##faculty hard nproc 50
#ftp hard nproc 0
##student - maxlogins 4
* soft memlock unlimited
* hard memlock unlimited
tomcat soft memlock 6291456
tomcat hard memlock 6291456
# End of file
# cat /proc/meminfo
MemTotal: 7928752 kB
MemFree: 737004 kB
Buffers: 0 kB
Cached: 417368 kB
SwapCached: 0 kB
Active: 487428 kB
Inactive: 324072 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 7928752 kB
LowFree: 737004 kB
SwapTotal: 2097144 kB
SwapFree: 2097020 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 397208 kB
Mapped: 72180 kB
Slab: 62136 kB
CommitLimit: 2915792 kB
Committed_AS: 748576 kB
PageTables: 3292 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 7028 kB
VmallocChunk: 34359731271 kB
HugePages_Total: 3072
HugePages_Free: 2305
HugePages_Rsvd: 897
Hugepagesize: 2048 kB
# ipcs -l
Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 7340032
max total shared memory (kbytes) = 4611686018427386880
min seg size (bytes) = 1
Semaphore Limits --------
max number of arrays = 1024
max semaphores per array = 250
max semaphores system wide = 256000
max ops per semop call = 32
semaphore max value = 32767
Messages: Limits --------
max queues system wide = 16
max size of message (bytes) = 65536
default max size of queue (bytes) = 65536
# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 65536
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 65536
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
On the Second VM it looks like this
cat /proc/meminfo
MemTotal: 16190448 kB
MemFree: 176812 kB
Buffers: 52752 kB
Cached: 755256 kB
SwapCached: 0 kB
Active: 713808 kB
Inactive: 425300 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 16190448 kB
LowFree: 176812 kB
SwapTotal: 35658896 kB
SwapFree: 35658796 kB
Dirty: 932 kB
Writeback: 0 kB
AnonPages: 333620 kB
Mapped: 79120 kB
Slab: 37492 kB
CommitLimit: 36356744 kB
Committed_AS: 646284 kB
PageTables: 3584 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 23500 kB
VmallocChunk: 34359713907 kB
HugePages_Total: 7224
HugePages_Free: 6654
HugePages_Rsvd: 582
Hugepagesize: 2048 kB
JAVA_OPTS="$JAVA_OPTS -Xms2G -Xmx2G -XX:NewRatio=3 -XX:MaxPermSize=256m -XX:SurvivorRatio=20 -Dsun.rmi.dgc.client.gcInterval=1800000 -Dsun.rmi.dgc.server.gcI
nterval=1800000 -XX:+UseParallelGC -XX:ParallelGCThreads=2 -XX:+UseLargePages -Xloggc:/apps/gc.log -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCApplication
ConcurrentTime -XX:+PrintGC -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Dfile.encoding=UTF8 -Duser.timezone=GMT+2 -Djava.security.auth.login.config=$CATALINA
_HOME/conf/jaas.config -Dorg.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES=false"
hepide01pep1:~ # ipcs -l
------ Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 8388608
max total shared memory (kbytes) = 4611686018427386880
min seg size (bytes) = 1
------ Semaphore Limits --------
max number of arrays = 1024
max semaphores per array = 250
max semaphores system wide = 256000
max ops per semop call = 32
semaphore max value = 32767
------ Messages: Limits --------
max queues system wide = 16
max size of message (bytes) = 65536
default max size of queue (bytes) = 65536
Did you tried with the less size of heap.. may be with 2gig. You can just do simple try with
java -Xmx3G -version .Let us know how it goes and what it spit out.
I have stumbled with this issue (errno 12) on CentOS 5.9 as well using 16G heaps.
After verifying hard / soft memory locks were unlimited in /etc/security/limits.conf and still getting the error, I started running java -version as suggested by Anil, with all of my JAVA_OPTS intact.
I have found that removing the "-XX:+UseLargePages" option gets rid of that error.
I hope this helps you!