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Viktor Szakats edited this page Oct 15, 2020
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Welcome to the Harbour wiki!
- Answers:
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See also these links:
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(more to come soon..)
Q: Is it safe to use unstable nightly version?
Q: Would an application compiled as 64 bit by Harbour operate faster on a 64 bit machine vs the same application compiled as 32 bit on the same 64 bit machine?
- Answer (by Przemek): Yes it will. Mostly due to the cost of switching between kernel and user space. In 64 bit mode we have extremely huge address space so it's possible to set fixed addresses for user space and kernel space and never reload memory descriptors when execution context is changed. Here depending on the OS and type of application )how many times system functions are called) the speed difference can be quite huge. Additional speed up is also reached due to wider set of machine instructions and completely new C ABI which uses extended 64-bit registers to pass parameters when C functions are called. This gives about 10-15% speed improvement in case of Harbour HVM.