Non-blocking operation

Tasklets as defined are orthogonal to Ada tasks and execute within the semantic context of the task from which they have been spawned, whilst inheriting the properties of the task such as identification, priority and deadline. The model also specifies that calls by different tasklets of the same task into the same protected object are treated as different calls resulting in distinct protected actions therefore synchronization between tasklets could be performed using protected operations (in [5] it was restricted to non-blocking operations). ... 

A modified version of the C function in Figure 3.1 using an MPI non-blocking receive, MPI Irecv, to avoid deadlock. The MPI Irecv returns without waiting for any message to arrive, and each process then proceeds to post the sending operation, MPI Send. The MPI Wai t causes each process to wait at this point until the message to be received by MPI Irecv has arrived. The employed MPI functions are explained in Appendix A. 

In Figure 3.2, we show a modified version of the function from Figure 3.1, which sends data around in a virtual ring. In the modified version, each process first posts a non-blocking receive operation to receive data from... 

Outline of systolic loop communication scheme using point-to-point message-passing (cf. Figure 6.8). The number of processes and the process ID are designated p and this proc, respectively. Non-blocking receive operations are employed to prevent deadlock. 

The send operations employed are non-blocking and can be overlapped with computation to some extent. Our performance model will take this into account by using effective a and /3 values measured for overlapped communication and computation. From Eq. 9.12 it is clear that the overall communication requirement for the P2 algorithm, namely, the total amoimt of data that must be sent per process, O( sheii0 n / p), is roughly inversely proportional to the number of processes, which is a prerequisite for a strongly... 

C bindings for some commonly used MPI point-to-point communication operations output parameters are underlined. All of the operations have return type int. The non-blocking counterparts to MPI.Ssend, MPI.Bsend, and MPI Rsend are MPI Issend, MPI Ibsend, and MPI Irsend, respectively these functions, which are not shown in the table, take the same arguments as MPI Isend... 

OS Monitoring activity has been supported by System Tap [H] with which a set of probes have been defined as two kernel modules. Due to the nature of kernel modules, the amount and the types of operations comprises in the modules affect performance and stability of system, thus, by common non-blocking IPC mechanisms, the data elaboration was moved outside the kernel modules as a user space application. 

A set of additional functions are provided in this API to obtain information about the characteristics of AFDX Port objects, in particular whether they support Read or Write operations, the kind of port (queuing/sampling), the Read operation mode (blocking/non-blocking), or the freshness of data in a sampling port. The value returned by the Freshness function corresponds to the last message obtained by Read. Time First is returned for a queuing port, or if Read has never been called for the specific port. 

Besides non-ideal operation, non-ideal module construction influences the module performance as well. Module performance refers to the recovery, which is the ratio of a product stream to the feed stream of the target compound, for a given product purity. The objective of manufacturing process is to produce uniform, defect free hollow fibers. Unfortunately, real membrane fibers are not uniform since small changes in production conditions as well as manufacturing tolerances result in different fiber properties. Variations in fiber dimensions (diameters, length, and membrane thickness) and fiber properties (permeability) as well as manufacturing defects (blocked fibers, pinholes) have an impact on the module performance. In particular, the variation of fiber diameters, which is one of the major drawbacks in module performance, was well... 

The utility and importance of multi-layer device structures was demonstrated in the first report of oiganic molecular LEDs [7]. Since then, their use has been widespread in both organic molecular and polymer LEDs [45, 46], The details of the operating principles of many multi-layer structures continue to be investigated [47—49], The relative importance of charge carrier blocking versus improved carrier transport of the additional, non-luminescent layers is often unclear. The dramatic improvements in diode performance and, in many cases, device lifetime make a detailed understanding of multi-layer device physics essential. 

The structure was refined with block diagonal least squares. In cases of pseudo-symmetry, least squares refinement is usually troublesome due to the high correlations between atoms related by false symmetry operations. Because of the poor quality of the data, only those reflections not suffering from the effects of decomposition were used in the refinement. With all non-hydrogen atoms refined with isotropic thermal parameters and hydrogen atoms included at fixed positions, the final R and R values were 0.142 and 0.190, respectively. Refinement with anisotropic thermal parameters resulted in slightly more attractive R values, but the much lower data to parameter ratio did not justify it. 

In the previous discussion the semiclassical separation of particles and antiparticles employed projection operators and the associated subspaces of the Hilbert space. By suitable choices of bases such a separation can also be constructed with the help of unitary operators rotating the Hamiltonian into a block-diagonal form. Such a procedure is closely analogous to the Foldy-Wouthuysen transformation that provides a similar separation in a non-relati-vistic limit. A (unitary) semiclassical Foldy-Wouthuysen transformation Usc rotates the Dirac-Hamiltonian Hd into... 

---