Abstract: A method, system and computer program product for sharing class data among virtual machine applications running on one or more guests in a virtualized environment. A control program in a virtual operating system is used to manage the user portions of the virtual operating system, each commonly referred to as a guest. A guest operating system runs on each guest and applications can run on each guest operating system. A memory management facility manages shared memory which includes a class cache configured to store class data. The shared memory may be mounted onto each guest using a cluster file system or accessed via an API interface thereby allowing the class cache to be shared across the guests. By sharing the class cache among the guests, multiple copies of the same class data are no longer necessary thereby optimally using the physical memory on the host.

Abstract: A specification of a routine name of a root of a call tree and a specification of a desired depth of call tree tracing are obtained. Upon entering a given routine in a program, a determination is made whether the given routine is the root. Responsive to determining that the given one of the routines is the root, trace information for the routine forming the root is output. Furthermore, upon entering a given one of the routines called, directly or indirectly, by the routine forming the root, a determination is made whether the given one of the routines called, directly or indirectly, by the routine forming the root of the call tree is within the desired depth from the routine forming the root of the call tree; and if this is the case, trace information is output for given one of the routines called, directly or indirectly, by the routine forming the root of the call tree.

Abstract: This docucment descirbes techniques for sharing Java class information in virtualized computing environments. In some embodimetns, an apparatus includes hardware components including one or more central processing units and main memory, wherein a portion of the main memory is configured to store shared Java classes. The apparatus can also include a hypervisor configured to control access to the hardware components, and to host a plurality of operating systems. Each of the operating systems can include a character device driver configured to write directly to the portion of main memory configured to store the shared Java classes. The apparatus can also include one or more Java virtual machines configured to execute the shared Java classes and modify the shared Java classes using the character device driver.

Abstract: Embodiments of the invention broadly contemplate systems, methods, apparatuses and program storage devices providing a mechanism in which a file system and copy command (or file transfer command) allows the start of a copy operation when a file is being copied to and allow the system to continue to read the file as and when it gets updated (appended with additional data), thus permitting automated simultaneous file transfer and copy operations.

Abstract: A method, system and computer program product for sharing class data among virtual machine applications running on one or more guests in a virtualized environment. A control program in a virtual operating system is used to manage the user portions of the virtual operating system, each commonly referred to as a guest. A guest operating system runs on each guest and applications can run on each guest operating system. A memory management facility manages shared memory which includes a class cache configured to store class data. The shared memory may be mounted onto each guest using a cluster file system or accessed via an API interface thereby allowing the class cache to be shared across the guests. By sharing the class cache among the guests, multiple copies of the same class data are no longer necessary thereby optimally using the physical memory on the host.

Abstract: Embodiments of the invention broadly contemplate systems, methods, apparatuses and program storage devices providing a mechanism in which a file system and copy command (or file transfer command) allows the start of a copy operation when a file is being copied to and allow the system to continue to read the file as and when it gets updated (appended with additional data), thus permitting automated simultaneous file transfer and copy operations.

Abstract: A specification of a routine name of a root of a call tree and a specification of a desired depth of call tree tracing are obtained. Upon entering a given routine in a program, a determination is made whether the given routine is the root. Responsive to determining that the given one of the routines is the root, trace information for the routine forming the root is output. Furthermore, upon entering a given one of the routines called, directly or indirectly, by the routine forming the root, a determination is made whether the given one of the routines called, directly or indirectly, by the routine forming the root of the call tree is within the desired depth from the routine forming the root of the call tree; and if this is the case, trace information is output for given one of the routines called, directly or indirectly, by the routine forming the root of the call tree.