cpu

I am looking around redis to provide me an intermediate cache storage with a lot of computation around set operations like intersection and union. I have looked at the redis website, and found that the redis is not designed for a multi-core CPU. My question is, Why is it so ? Also, if yes, how can we make 100% utilization of CPU resources with redis on a multi core CPU's. I have looked at the redis website, and found that the redis is not designed for a multi-core CPU. My question is, Why is it so? It is a design decision. Redis is single-threaded with epoll/kqueue and scales indefinitely in

i assume cpu has direct access to motherboard's BIOS and RAM.(correct me if i'm wrong) But how does cpu communicate with other hardware like hdds, expansion cards, peripherals, other BIOSes etc.? I know about OS and its drivers, but they are software- they're in RAM. How does cpu communicate with all this hardware on hardware level? Isn't it limited to only motherboard's BIOS and RAM? In older architectures, peripherals were accessed via a separate mechanism to memory access with special I/O instructions. On x86, there were (and still are!) "in" and "out" instructions for transferring bytes

I am trying to understand the concept of Rx and Tx descriptors used in Network driver code. Are Descriptors in software(RAM) or hardware (NIC card). How do they get filled. EDIT: So in a Realtek card driver code. I have a following struct defined. struct Desc { uint32_t opts1; uint32_t opts2; uint64_t addr; }; txd->addr = cpu_to_le64(mapping); txd->opts2 = cpu_to_le32(opts2); txd->opts1 = cpu_to_le32(opts1 & ~DescOwn); So are the opts1 and opts2 and there bits like DescOwn card specific? Will they be defined by the manufacturer in the datasheet? Thanks Nayan Quick Answer: They are software

I am reading an awesome OpenGL tutorial . It's really great, trust me. The topic I am currently at is Z-buffer. Aside from explaining what's it all about, the author mentions that we can perform custom depth tests, such as GL_LESS, GL_ALWAYS, etc. He also explains that the actual meaning of depth values (which is top and which isn't) can also be customized. I understand so far. And then the author says something unbelievable: The range zNear can be greater than the range zFar; if it is, then the window-space values will be reversed, in terms of what constitutes closest or farthest from the

I'm developing a Java app and would like to see how it runs on slower/overloaded machines. (I suspect there may be some thread unsafe issues, etc. that get ignored because my machine just compiles it quickly enough. Is there a way to simulate high CPU load/limit available CPU for the Java app? Of course, I could write a script to actually overload my CPU with various tasks, but I would prefer to keep the rest of my OS running smoothly and not overheat my machine, if possible. Is there an easy/known way to do this? I am currently using Eclipse Kepler as my IDE, but would be willing to switch if

I'm trying to figure out if I can use OpenACC in place of normal CPU serial execution calls. Usually my programming is all about 3D programming, or uses the GPU normally in some way. I.E. Image processing, or some other type of rendering that requires the use of shaders. I'm trying to figure out if this Library would benefit me or not. The reason I ask this is because if I'm rendering 3D Graphics (as fast as possible) would it slow down that process in away? Or is it able to maintain it's (in theory) "high frame rates" or not. If so, what's the trade off, and how much? I'm not willing to loose

The task is for architecture ColdFire processor MCF5271: I don't understand how many and what size cycles will be needed to perform a longword transfer to the CPU, or word transfers. I'm reading the chart and I don't see what the connection is? Any comments are very appreciated. I've attached 2 examples with the answers. DATA BUS SIZE The MCF5271 manual discusses the external interface of the processor in Chapter 17. The processor implements a byte-addressable address space with a 32-bit external data bus. The D[31:0] signals represent the data bus, the A[23:0] signals represent the address