each time. Based on this feature, we should NewRatio allocate the new generation space of the appropriate size by specifying the parameters of the hotspot JVM in different operating systems. Table 2: Default values under different operating systems and configurations NewRatio
operating system and Parameters
default-xx:newratio
Sparc-server
2
Sparc
Sparc-tso
N
N
N
Y
N
x86
N
N
N
Y
N
Ia64
Y
Y
Y
Y
N
Powerpc
Y
Y
Y
Y
N
The "N" in the table cell indicates that the processor does not allow two operations to be reordered, and "Y" means that reordering is allowed.As we can see from the table above, common processors allow store-load to
, the program can get the result of x = y = 0.In the order in which the memory operation actually occurs, the write operation A1 is really executed until processor a executes A3 to refresh its write buffer. Although processor a performs memory operations in the order of: A1->A2, the actual order in which the memory operations actually occur is: A2->A1. At this point, the sequence of memory operations for processor A is reordered (the case of processor B is the same as processor a, which is not d
processors:
Load-load
Load-store
Store-store
Store-load
Data dependency
Sparc-tso
N
N
N
Y
N
x86
N
N
N
Y
N
Ia64
Y
Y
Y
Y
N
Powerpc
Y
Y
Y
Y
N
The "N" in the table cell indicates that the processor does not allow two operations to be reordered,
24 bits of the mantissa (1 of the left side of the decimal point is hidden), so the maximum mantissa that can be expressed is 2^24-1=16,777,215, so the single-precision floating-point number can be expressed in decimal values, the truly valid numbers are no higher than 8 bits.
3) Double precision format
The IEEE double format consists of three fields: 52-bit fractional F, 11-bit offset exponent E, and 1-bit sign s, which are stored consecutively in two 32-bit words, as shown in the following il
2016 is destined to be a year of virtual reality technology booming. The most anticipated consumer-grade product in the foreign media cnet Eye is Oculus Rift. This Facebook-affiliated virtual reality system will require a PC-side fit and support for the Xbox GamePad compatibility. The consumer-grade Oculus is expected to be released in the first quarter of next year.HTC Vive:HTC Vive is another virtual reality product that needs to be used in conjunction with the PC, which was originally planned
Mobile phones are moving towards the era of excess performance ~
Http://www.tomsguide.com/us/dual-core-single-core-Xperia-Play-PlayStation-Snapdragon,news-12474.html
A dual-core SOC embedded in a smartphone doesn' t necessarily mean the device will be faster than a single-core phone, claims Sony Ericsson.
Zoom
On September 18, Sony Ericsson will launch the PlayStation-certified xperia play smartphone on at
Sparc-tso
N
N
N
Y
N
x86
N
N
N
Y
N
Ia64
Y
Y
Y
Y
N
Powerpc
Y
Y
Y
Y
N
The "N" in the table cell indicates that the processor does not allow two operations to be reordered, and "Y" means that reordering is allowed.As we can see from the table above, common processors allow store-load to
There was a client recovery request this morning, and he accidentally used the RM-RF oradata command in the Solaris system to delete all the data files under one partition. Now do not know how to do, ask us to give support. Check it out. found that the database is not crash, it seems that directly consider the use of handle recoveryROOT@CNISORCLSVR # Uname-aSunOS cnisorclsvr 5.9 generic_112233-08 sun4u SPARC sunw,sun-fire-880ROOT@CNISORCLSVR # Ps-ef|g
machine collectively referred to as RISC processor. This allows it to perform operations at a faster rate (more millions instructions per second, MIPS). Because the computer performs each instruction type requires additional transistors and circuit elements, the larger the computer instruction set, the more complex the microprocessor and the slower the operation.John Cocke of the IBM Research Center in York, NY, showed that about 20% of the instructions in the computer bore 80% of the work, and
qemu
KVM is a kernel module and cannot be directly used by users. Here we will use qemu (also called the KVM prefix) to use KVM
1. First check qemu-KVM:
# emerge -pv qemu-kvmThese are the packages that would be merged, in order:Calculating dependencies... done![ebuild R ] app-emulation/qemu-kvm-0.15.1-r1 USE="aio alsa jpeg ncurses png pulseaudio sdl ssl vhost-net -bluetooth -brltty -curl -debug (-esd) -fdt -hardened -nss -qemu-ifup (-rbd) -sasl -spice -threads -vde -xattr -xen" QEMU_SOFT
Solaris10LowerMySQLInstallation and maintenance
MySQL is a very popular database system in open-source software. However, it cannot be started successfully when it is installed on Solaris according to the installation manual provided on the MySQL website. This article describes how to correctly install and start MySQL on Solaris 10.Software and hardware environment:* Sun5.10* Solaris 10* MySQL 5.5.12 (mysql-5.5.12-solaris10-sparc-64bit.pkg.gz)Installa
near the assigned upper limit during the run.The assigned upper limit value mentioned here can also be called the estimated upper limit value.The benefit of introducing an estimated upper value is that you can effectively control the size of the heap. The smaller the heap, the higher the efficiency of the GC.Note: The size of the estimated upper limit value must be less than or equal to the maximum value.
-xx:maxnewsize=size
1.3.1 Sparc
. Although processor a performs memory operations in the order of: A1->A2, the actual order in which the memory operations actually occur is: A2->A1. At this point, the sequence of memory operations for processor A is reordered (the case of processor B is the same as processor a, which is not discussed here).The key here is that because the write buffer is visible only to its own processor, it can cause the processor to perform memory operations in a sequence that is inconsistent with the actual
with the actual order in which the memory is actually performed. Because modern processors use write buffers, modern processors allow for reordering of write-read operations.The following is a list of the types of reordering that are allowed for common processors:
Load-load
Load-store
Store-store
Store-load
Data dependency
Sparc-tso
N
N
N
Y
N
x86
N
How to view the version number of the Solaris operating system
I know the following three ways to Showrev, uname and view/etc/release.
(1) Command Showrev
Show machine, software revision, and patch revision information
(2) Command uname
The print name of current system. Parameter-a:P rints basic information currently available from the system.
(3) View/etc/release
The demo is as follows:
bash-3.00$ showrev hostname:sunv890 hostid:84b7fe80 release:5.10 Kernel architecture:sun4u Application arc
the database Administrator (DBA). The image of the pattern-inner mode defines the correspondence between the data logical structure and the storage structure. For example, the internal representation of a field, and so on. When the storage structure of the database changes, the image of the pattern-inner mode must be modified accordingly so that the pattern remains invariant. This is still the responsibility of the DBA. It is because of the above two-level image function and its automatic imple
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